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It's a race against time to find Jor-El when Clark realizes that he is on Earth and Zod realizes that he could hold the key to their powers. Chloe is the first to meet him, while Zod enlists Tess.

Oliver offers to train a new girl, Mia, to keep her safe from danger. Lois and Clark are stunned when a radio station want both of them to be their new hosts.

A woman forces Oliver to play in a dangerous game and then turns up dead. The police believe Oliver is responsible and arrest him. Meanwhile, Lois confronts Clark over his knowledge about Oliver's suicide attempt.

Tess forces Oliver to come to a Queen Industries gala to put the Board at ease, but things go awry when the Toyman shows up with a bomb and a plan to take revenge on Oliver.

Zod releases a virus that transforms humans into zombies throughout Metropolis, with the only cure being found in the blood of a Kryptonian. When Lois is infected, Clark is forced to choose between using his own blood to create an antidote, which would reveal his presence to Zod, and doing nothing.

Lois' new colleague, John Corben, undergoes a horrific transformation when he awakens from an accident with superhuman strength and a heart made of kryptonite. Determined to use his new power to further his vendetta against the Blur, Corben sets out kill the vigilante. However, the situation becomes even more complicated when Lois' own investigation leads her into Corben's hands.

Clark decides that he is ready to start his training at the Fortress, but Jor-El insists that he return to Metropolis to cut his ties with Lois before he begins. Lois reappears in the city with no recollection of vanishing, and her investigation into a monorail crash brings her into contact with a new reporter named John Corben... who is opposed to the Red and Blue Blur. Meanwhile, Chloe's friendship with Clark deteriorates when he refuses to use the Legion ring to save Jimmy; Oliver turns down a dark path, and Zod makes his entrance at the Luthor mansion.

Oliver tells Clark he must kill Davis as Doomsday is a serious threat and must be stopped at all costs. However, Clark struggles with taking a human life, so the Green Arrow and his team decide to take matters into their own hands. Lois takes on Tess, but the fight takes a shocking turn. Meanwhile, Chloe gets caught in the middle of Oliver and Clark’s battle over killing Davis.

Chloe returns and begs Clark to kill Davis, claiming he can no longer keep the beast under control. Tess has assembled a team of meteor freaks, including Plastique, to track down Davis so Clark can kill him. However, things get out of hand once Tess’ team discovers she is double-crossing them.

Clark discovers that Davis is still alive and confronts Chloe about protecting him. Oliver discovers Jimmy breaking into Chloe’s apartment, but things get rapidly worse after Davis jumps from the shadows and attacks both of them.

Lois needs a big story to boost her career, but the Red-Blue Blur proves too challenging for her investigative skills. However, when she rescues Chloe from a mugger, Lois decides to take advantage of the situation and disguise herself as Metropolis' newest hero - Stiletto. Although Clark disapproves, he soon finds himself counting on her help.

Tess tries to kill Davis by blowing up his truck. However, after he escapes, she realizes she needs help to destroy him and turns to Clark. Tess reveals Davis' secret childhood with the Luthors and hints that she knows Clark's true identity. Meanwhile, Davis runs to Chloe for help.

Chloe’s birthday wish, to be granted by a magician named Zatanna, is to be more like Lois. Zatanna switches the two into each other’s bodies. She grants Clark his deepest wish and she searches for her father’s book of spells so she can conjure up his spirit.

Tess invites Clark to a press conference in New York but when an explosion rocks the private jet they are on, Clark must figure out how to save them without Tess learning his secret. Unbeknown to Clark, Tess orchestrated the explosion to get Clark to reveal his powers. Meanwhile, Davis discovers a surprising way to control the monster within.

The media seems to have gotten the best of Clark, as they are in a frenzy over the Red-Blue Blur. Earlier spoilers have mentioned villainous Linda Lake (Tori Spelling) threatening to expose Clark’s secret, but he wants to tell the public on his own terms. Entertainment Weekly’s Ausiello has confirmed that it’s indeed Lois Lane who does the interview with Clark which reveals his true Kryptonian heritage to the world. Meanwhile, Chloe is constantly pestered by reporters who keep asking her what it’s like to be a hero’s best friend. She also refers to Jimmy, who has been transported to Metropolis General, as her husband, implying that her memories have been restored.

A toymaker with a grudge targets Oliver Queen, and blows up the LuthorCorp board of directors.

Clark catches Tess at Lana's apartment, and Tess reveals what happened to Lana during her coma. Meanwhile, Tess learns startling information when she breaks into a secret LuthorCorp facility.

Clark goes undercover as policeman Joe Fordman to solve the shooting of John Jones. Meanwhile, Lana confronts Tess and gives her some startling information.

Three youthful heroes travel from the distant future to Clark's present to help him remove Brainiac's influence from Chloe.

Chloe and Jimmy have unexpected arrivals at their ceremony. Oliver is shocked to see Lana after expecting to find Lex. Lois and Clark begin to fall for each other.

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Clark receives a package from an anonymous benefactor, which contains the blue Kryptonian crystal. When he touches it, he and a visiting Lois are transported into the Phantom Zone, where they meet the captive Kara. She manages to open a portal but Zod's imprisoned wife Flora takes over Lois' body, returns to Earth, and goes on a rampage with her superpowers.

When Jimmy gets a photo of a superspeeding Clark rescuing Lois, Tess wants to publish the photo in the Daily Planet. Clark asks Chloe to use her influence with Jimmy to help destroy the photo, but she refuses.

A serial killer is on the loose in Metropolis, and Clark suspects Davis, who has blackouts whenever the killer strikes.

Clark and Lois go undercover as lovers to locate a kidnapper who abducts couples.

Maxima, an alien ruler with the power to make herself irresistible to men, comes to Earth seeking a mate... and sets her eyes on Clark.

When Oliver Queen is stricken by a slow-acting poison during a charity event, he remembers back to when he was stranded on a deserted island, learned how to use the bow and arrow... and met Tess.

Chloe takes in a young girl with a dark secret... and explosive powers.

In the aftermath of Clark's disappearance, Green Arrow gathers a team of heroes to find their missing comrade. Meanwhile, a secret group kidnaps Chloe upon learning she has superpowers, and a new CEO takes over LuthorCorp in Lex Luthor's absence.

Kara tells Lex he is destined to defeat the Traveler and offers to take him to the Fortress to learn how. Clark is stunned that Kara would go to Lex but it is revealed that Brainiac is impersonating Kara and she's actually trapped in the Phantom Zone. Chloe is arrested by the Department of Domestic Security and Lana awakens from her comatose state. Meanwhile, in an epic turn of events, Clark and Lex face off in the Fortress and Lex learns Clark's secret.

While Lex considers the ramifications of his discovery in the deposit box in Zurich, Jimmy researches the symbols in the Kawatche caves, while Clark investigates a mysterious symbol that leads him to the last surviving Veritas member.

Clark has discovered that Brainiac plans to destroy him as a baby, but believes the world would be better off without him and refuses to go back to save himself. He then finds himself swept into an existence where he never existed, and discovers what happens to an Earth without him.

While Clark tries to find Brainiac and Kara, Chloe inadvertently draws the government's attention with her computer searches. A NSA agent forces Jimmy to spy on his girlfriend and determine if she's working for a terrorist cell as they suspect. Meanwhile, Lex recovers the box in Zurich and discovers there are people who will kill to keep him from obtaining its secrets.

Lex seeks the key in Lionel's locket so that he can uncover the secret of Veritas that will give him control of the Traveler. In his quest, he takes the last final step to evil by killing someone close to Clark.

Brainiac seeks out Kara to convince her to come with him, and when she refuses he strikes at someone close to Clark. Meanwhile, Lex attempts to get the information on Veritas that Lionel has hidden away, and begins to remember what really happened on the day of the meteor shower.

Clark is abducted and held in a kryptonite-lined cell at an abandoned hanger. After Chloe and Lana find a military electric probe at the farm, they confront Lionel, who suggests Lex may be responsible. Chloe and Lana get Kara away from Lex and get her to the Fortress, hoping Jor-El can restore her memories. Meanwhile, the daughter of Dr. Swann meets with Lex to discover his father's involvement with the Veritas group.

Pete is working as a roadie for OneRepublic and develops super-stretching powers after chewing kryptonite-tainted gum. He ends up rescuing Kara and decides to go public with Jimmy's help. However, Lex puts pressure on him to steal Kara's bracelet from Lionel, by threatening to reveal Chloe is a meteor freak.

Lex finds Kara in Detroit working as a waitress and offers to restore her memories, only to be shot in the head by an obsessive busboy. Clark must use experimental LuthorCorp technology to enter Lex's memories and find out where Kara is, while Chloe contemplates whether to use her powers to heal Lex, despite the risk to herself.

Chloe, working with Oliver Queen, intercepts one of Lex's files but is attacked by the Black Canary, a vigilante who takes the info from her. The woman returns the info to Lex, who asks her to take out the vigilante that has been attacking his operations: Green Arrow.

Bizarro adopts to his new life with Lana, pretending to be Clark. Meanwhile, the real Clark remains frozen in the Arctic thanks to the Jor-El programming. However, Bizarro needs the help of Brainiac to stabilize his form and the two make a deal. Meanwhile, Grant goes to Lionel and reveals his true identity, much to Lex's anger.

Clark returns to Smallville from the Fortress and tells Lana that Kara is gone. Clark tells Lana they should team up to being Lex down, so she gives him all the information she's gathered so far. Adrian secretly plants a bomb on Chloe and tells Lois if she doesn't get Lex to admit the truth about his experiments with cloning, he will detonate the bomb. Chloe, thinking she is about to die, confesses to Jimmy that she is a meteor freak.

Clark hears the voice of his biological mother, Lara, calling for help from Kara's crystal and decides to release her, despite Jor-El's warnings. Lara and Clark reunite and she gives him Jor-El's ring, which contains blue kryptonite. As Clark puts it on, he realizes Zor-El manipulated the whole thing and that blue kryptonite strips him of his powers, enabling Zor-El to take control of the Fortress of Solitude. Meanwhile, Chloe and Lex each discover Lois and Grant have been seeing each other and warn them to stop.

Kryptonite and high voltage mix during a lightning storm, causing Lana to absorb Clarks powers. Using her newfound super powers, she breaks into Lex's safe and steals incriminating evidence which she then delivers to Lois and Grant, demanding they run a story exposing Lex's secrets. After Grant refuses to use stolen material, Lana decides to take care of Lex herself. Clark tries to stop Lana from killing Lex and a super battle ensues between the two.

Clark learns Kara is in Washington searching for the crystal. Kara is captured after she breaks into the lab and sedated with a kryptonite-infused truth serum. The serum causes her to relive a prior trip to Earth when she followed Clark's biological mother, Lara, to the Kent farm. Clark arrives in time to save her but, after searing the machine with heat vision, he also falls victim to the serum and sees what Kara sees: his mother.

The residents of Smallville are thrilled when "Warrior Angel," a movie based on a comic book, begins shooting in town. However, after the lead actress, Rachel Davenport takes off in stunt car with cut brakes, Clark must step in to stop the runaway car. Unfortunately, an obsessed fan witnesses this heroic event and decides Clark is a real life superhero, whose girlfriend Lana must be eliminated so Clark can fulfill his destiny. Meanwhile, Lex discovers Lionel at the cabin.

Chloe learns that a doctor, Dr. Curtis Knox, has been treating meteor-infected people and removing their abilities. Desperate to get rid of her powers, Chloe makes an appointment to see him, unaware that Dr. Knox has a nefarious plan to kill his patients and harvest their organs. Meanwhile, Kara cons Jimmy into helping her locate her crystal and defies Clark's order to stay on the farm after she discovers its whereabouts. Lana sets up secret surveillance of Lex.

Clark hopes Kara will keep a low profile, but three meteor-infected girls want to use her as part of their scheme after one of them sees Kara's special powers.

Clark meets his cousin Kara, but decides that there is nothing for him in Smallville without Lana, so he heads to the Fortress of Solitude to begin training as a superhero. Once there, Jor-El tells him Kara's father is evil and she is dangerous, so Clark must return to Smallville.

As the seventh season begins, Clark faces his most deadly enemy---his Bizarro doppelganger---after Lex's secret lab at Reeves Dam is destroyed; Lex is saved from drowning by a mysterious female savior, but his past catches up with him.

John returns to defeat the last phantom but it proves to be a tough task. Clark confronts Lionel after he discovers Lana was blackmailed into marrying Lex. Lana leaves Lex and plans to get away from Smallville whilst Lois heads to Reeves Dam in search of Lex's secret laboratory.

A crooked senator threatens to expose Lex's secret labs where he's developing a super soldier so he sends Wes Keenan to kill him. When Lois witnesses the attack, she becomes Wes' next target.

Chloe and Jimmy are shocked to find Lana has been shot in the elevator at the Daily Planet. Jimmy is knocked unconscious whilst studying photos of the scene and dreams of Metropolis in the 1940s.

When Lex is trapped deep inside underground tunnels by the wife of a former test subject, Clark sets off to find him but is rendered powerless by the kryptonite-laden walls. The only way the two of them will make it out alive is if they put their differences aside and help each other.

Lex brings Chloe's mother, Moira, out of her catatonic state and uses her to control other meteor freaks. Lana makes a shocking discovery about her pregnancy.

Clark and Chloe locate another Zoner in a fight club which prompts Clark to seek a way in, knowing he'll probably have to expose himself. Lois catches wind of the fight club and desperate for a good story, she manages to get in but is put up against a fighter she wasn't expecting.

On Lex and Lana's wedding day, Dr. Langston threatens to tell Lana the truth about her pregnancy but Lex will do anything to silence him. Clark is willing to tell Lana his secret in order to stop Lana marrying Lex.

Clark and Chloe discover that Lex is using a young man's ability to identify meteor freaks to help him further his experiments. When Lana finds out, she tries to persuade him to stay silent, fearing he'll expose Clark as one of the infected.

Lana receives a photo of herself, taken inside the mansion and decides to hide from her stalker in a surprising location. Jimmy thinks Chloe still sees Clark as more than a friend and breaks up with her.

Lois tries on lipstick made with red kryptonite and becomes infatuated with the first man she sees... Clark. The two share a kiss which causes Clark to lose all of his inhibitions and he decides to gatecrash Lana and Lex's engagement party.

Clark wakes up in a mental hospital where the physician in charge, Dr. Hudson, informs him that the past five years were not real and only a figment of his imagination. Clark must come to terms with life as a normal human being as Dr. Hudson tries to persuade him to accept his treatment to cure his paranoid schizophrenia.

Oliver introduces Clark to some familiar faces, who are now working alongside Green Arrow. When one member of the team is captured during a mission, Clark must help the others mount a rescue effort. Lois looks forward to a trip to Monte Carlo but Oliver has some disappointing news for her.

When the Daily Planet's gossip columnist, Linda Lake, publishes a story on Clark, Lana and Lex using details from a private conversation, Lana accuses Chloe of betraying her. Lois begins to suspect Oliver might be the man behind Green Arrow.

Clark discovers illegal immigrants are being exploited at the neighbouring farm and seeks help from Martha to allow a boy and his mother to stay in the country.

Lex is imprisoned in another plane of existence by a man who can shift through alternate frequencies. Meanwhile, a Zoner is sucking the bones out of people in Seattle and Clark must investigate and prevent any more grisly deaths occurring.

The Green Arrow is shot whilst trying to save a couple from a carjacking. Clark finds Oliver is alive and well the next day but his behaviour is somewhat erratic so Clark attempts to get to the bottom of Green Arrow's miraculous recovery. The rivalry between Oliver and Lex comes to a head whilst Lana receives some shocking news.

Clark is reunited with Raya but there's little time to catch up as Baern, a phantom from the Phantom Zone, makes his way to Smallville intent on killing Clark.

Lex and Oliver meet up at the Excelsior Academy 10 year reunion. When two of his friends die in suspicious circumstances soon after, Oliver suspects Lex is involved.

After writing an article about the 'Green Arrow Bandit', Lois is kidnapped. Lex lets Lana in on his latest project, studying the mysterious black box.

Clark, Chloe and Jimmy investigate a strange vine that is killing people in the woods. Meanwhile, Lex throws a costume ball to benefit the victims of Dark Thursday.

Clark develops a cold for the first time which leads to the discovery of a new ability. Lex hires a private investigator to find out who it is that's following him. Meanwhile, Lois writes her first article on the weather.

Clark is trapped in the Phantom Zone, a barren desert full of criminals that were sent there by Jor-El. His only hope of escaping lies with a mysterious woman. Back on Earth, Zod plans to use Kryptonian technology to create New Krypton. Martha and Lois land near the Fortress of Solitude where Jor-El instructs Martha to kill Zod.

In Smallville's fifth-season finale, Clark's kryptonian origins threaten the Earth and the population, which Clark must make a huge sacrifice and a decision… This decision will affect all of the citizens around him, affecting Lex, Lionel, Lana and Clark are set in motion, in the moment for which all his trials have prepared him for. Meanwhile Milton Fine unleashes a deadly virus that effects millions, and Lionel is again channeled by Jor-El who helps Clark (Kal-El) in the on sought battle between good and evil.

Clark is visited by whom he believes to be the ghost of his deceased father Jonathan Kent. This ghost then informs Clark to kill Lionel Luthor, which confuses Clark. Meanwhile Lex Luthor creates a vaccine for Fine’s deadly virus, but to Lex’ dismay Fine intervenes and injects him with the vaccine. This causes an allergic chain reaction, with a shocking effect.

Clark is not taking his break-up with Lana well, as she has now moved on with Lex. Clark then meets a man by the name of Graham Garrett whose life had been saved by Clark a little bit earlier. However Clark finds out that this new friend may be dangerous in more ways then one. Meanwhile Lois is given the job of Martha’s new Chief of Staff.

After Martha's life is put in harms way by a mad tormentor, only Lionel could save her after he is taking hostage by the masked-man. Lionel must win a series of elaborate games in order to survive. Meanwhile Clark confronts Martha about Lionel knowing his true secret, which was told to him by his late father Jonathan in the episode Void. Also Lex confronts Lana about intimacy that occurred.

Clark befriends a second generation meteor victim, a girl who is able to control glass with her thoughts. After the girl's foster parent is murdered by telepathy with glass, Lois begins to suspect she may be a killer; but Clark believes otherwise. Meanwhile, the relationship between Lana and Lex steams up.

Lana becomes addicted to a serum containing green kryptonite that allows her to to contact her deceased parents; as do Clark and Lex who are purposely injected with the serum which allows them to channel their late parents. Meanwhile, Lionel continues his efforts to get even closer to Martha Kent.

Dr. Milton Fine aka Brainiac returns; this time deceiving Lex Luthor into helping him free General Zod. Using Lex's weakness of spaceships against him Lex accepts the terms... Meanwhile Clark is hypnotized by a young women wearing a crystal that can manipulate brainwaves into becoming her intimate item, only to try to persuade Clark into killing Lex Luthor.

Victor Stone half-human and half-machine is released by a Doctor, we find out Victor was being experimented on by LuthorCorp. After Lana crashes her car into him, he appears to survive with out a scratch.. Lana confronts Clark who becomes friends with Victor and agrees to help Victor find his girlfriend Katherine. But Lex wants him back for his own personal agenda. Meanwhile Martha is black-mailed with a dvd video of Clark saving Lana.

When Lois finds a corpse in the walls of The Talon, the spirit is released; Clark and Lois must now team up to find the killer. Who has murdered women around Smallville for the last ten years; after Lois is kidnapped it is up to Clark to rescue her before it is too late.

Still struggling with the grief of his deceased father, Clark encounters a woman after his mother is mugged, named Andrea, in Metropolis who has similar powers to him which she obtained during the second meteor shower after a heart transplant. She has taken the role of a vigilante super hero, and is out to find out who murdered her mother a year earlier... Meanwhile a different side of Clark emerges because of the death of his father.

In the 100th episode, Clark Kent confess to Lana his true identity; upon this, he takes her to the Fortress of Solitude and asks her to marry him. But as fate would have it, someone close to him will die. Can Clark change the outcome of events that are destined to occur, or will the outcome of death be inevitable? Meanwhile, the senatorial race heats up as the winner is determined.

After a bomb scare, Lex and Lana are trapped inside a mansion by two sadistic police officers named Greg and Harris, who want nothing more than the spaceship that crashed during the second meteor shower. Meanwhile the campaign between Lex and Jonathan goes neck and neck, and budget problems become an issue for the Kents...

Lex arranges a photo-op at the hospital, where he meets Samantha, the president of the Students for Lex Luthor club, who is more than a die-hard fan of his cause. Meanwhile Jonathan Kent starts to receive death threats from an anonymous source who demands he drops out of the race, while Martha Kent makes an unusual deal with Lionel Luthor...

Lex is given an envelope with damaging information that could destroy Jonathan's life and must decide whether he will use it, as it will also bring harm to Clark and Martha. Before he can decide what to do, Lex is shot and falls into a coma. He dreams that his mother visits him and shows him the life he could lead if he walks away from his father and LuthorCorp. In this alternate life, Lex is happily married to Lana with a baby on the way. Meanwhile, Chloe asks Clark to use his powers to deliver Christmas presents to needy kids. When Clark meets a disgruntled Santa Claus who has lost all his Christmas glee...

After Martha contracts a strange disease and is given hours to live, Clark turns to Professor Fine, who convinces Clark that Jor-El is the one responsible for her illness and the only way to save her is to destroy the Fortress of Solitude. However, once the two arrive at the Fortress, Professor Fine tries to free Zod and kill Clark...

Clark is exposed to silver kryptonite, causing him to have paranoid delusions. The silver kryptonite makes him believe that Chloe is going to reveal his secret, Jonathan is scheming against him with Lionel and Lex and Lana are having a secret relationship. Chloe and the Kents frantically search for a cure, but it is Professor Fine who comes to Clark's rescue - but not without an agenda...

Clark and Jonathan are thrilled when Senator Jake Jennings, Jonathan's oldest friend, arrives at the Kent farm looking for support in his re-election campaign. However, after a young girl turns up dead, it is revealed that she was a stripper and Jennings’ mistress, which makes him the prime suspect. Searching for answers, Chloe convinces Lois to go undercover as a stripper...

Lana decides to enroll at Metropolis University at the last minute and is forced to join a sorority to find housing at such a late date. However, her new sorority sisters offer her more than a place to crash after they turn her into a vampire and instruct her to kill Clark. Meanwhile, Chloe applies for an internship at the Daily Planet, but the newspaper's formidable editor may be more then she can handle.

A summer beach party at Crater Lake takes a dramatic turn when Lois hits her head while jumping into the lake. Before Clark can save her, a mysterious swimmer, Aquaman, a.k.a. AC, comes to her rescue, out-swimming Clark and leaving him baffled. Meanwhile Professor Fine tells Clark that Lex is behind a covert operation manufacturing weapons. AC attempts to break into the Luthercorp Marine Center in an attempt to destroy one of Lex's torpedoes and is captured by Lex...

Chloe is warned by Gabriel that he is going to set off a missile and obliterate all of Smallville. Still stripped of his super powers, Clark confronts Gabriel and ends up getting shot. In the hospital, Clark flatlines and his fate is left in Jor-El’s hands. Meanwhile, Lex believes Lionel has the key to open the spaceship. While back at the Fortress of Solitude, a newly vamped Clark/Kal El is confronted by his late father...

Jor-El strips Clark of his powers, making him human. Delighted to finally be “normal,” Clark pursues a relationship with Lana, sans secrets. However, after Lana, Jonathan and Martha are taken hostage by three thugs, Clark must figure out how to save his family without his super powers...

Having been transported to the Fortress of Solitude, Clark is confronted by Jor-El, who tells him he cannot return to Smallville, instead he must stay and prepare to save the planet. Also, transported to the Fortress, Chloe is unable to handle the sub-zero temperature and collapses, begging Clark to use his powers to save her. Jor-El forbids him to leave, but finally acquiesces, telling Clark he must return before sunset or there will be dire consequences. Meanwhile, Lana is horrified when she sees two Kryptonian aliens emerge from a spaceship discovered in the remnants of the meteor shower. The two aliens destroy what's left of the town searching for Kal-El.

Clark begins to piece together the reason he was sent to Earth after he has a nightmare that something horrible is going to happen to Smallville and heads to the cave to seek answers from Jor-El. His biological father tells him he must reunite the three crystals immediately or a disaster of epic proportions will befall the planet and even Clark won't be able to stop it. Meanwhile, Lex first helps Lana escape Smallville after the death of Genevieve Teague then takes shocking action to get one of the crystals away from Lionel. Realizing the crystals are connected to Clark, Chloe tries to stop Lex from discovering the truth...

Clark must stop the school photographer after he sets up a secret simulated high school and begins kidnapping students -- starting with Chloe -- to keep the glory days of high school going forever. Lex and Lionel are kidnapped and tortured by the Teagues in an effort to find the crystal. However, after Genevieve realizes Lana has the crystal, she decides to put an end to the hunt once and for all...

Clark and Lana discover an abandoned baby in the cornfield and take him back to the Kent farm. However, once the baby ages from a newborn to a 7-year-old in a matter of days, the two realize he is aging at a rapid rate and frantically search for a cure before the disease kills him. Meanwhile, Genevieve orders Lionel to kill Lana or else she will send him back to prison...

Kevin, a boy who can cause people to temporarily lose their memory, turns his powers on Clark and causes him to have total amnesia. Chloe discovers what has happened and must teach Clark about his superpowers while simultaneously trying to keep him from accidentally revealing them to others. On his trip down memory lane, Clark meets Lana, falls in love all over again and decides to share his secret with her. Lex takes advantage of the situation and convinces Clark to show him where the three stones are hidden...

A stunned Chloe is nominated for Prom Queen and tries to talk a reluctant Clark and Lana into attending the dance with her. However, after her rival Dawn, a wannabe Prom queen, crashes her car into a ravine filled with kryptonite, Dawn's spirit is released and she enters the bodies of the others making them act out of character. As a result, Lana asks Clark to be her date, Lois attends the Prom and Chloe sets the school on fire. Lex gives the seniors a special gift by having the band Lifehouse play at the dance...

A glimpse of the future Lex Luthor is revealed after a kryptonite explosion splits Lex in two and his evil side - Alexander - is released. Alexander immediately imprisons Lex in the mansion and begins his rampage by trying to kill Clark and Chloe in the lab, jousting with Lionel and convincing him to return to the dark side and finally, threatening to close the Talon unless Lana moves in with him...

Lois' younger sister, Lucy, with whom Lois doesn't get along, comes to town and charms everyone she meets. However, Clark discovers a darker side to Lucy after he catches her stealing money from a bar and forces her to reveal the truth about her sudden appearance in Smallville - a truth that puts Lois in grave danger. Meanwhile, the crystal disappears from Lana's apartment and Jason accuses Lionel of stealing it. Lois' sister, Lucy, appears in this episode.

After learning that Jason and Lex are in China searching for one of the mysterious kryptonian crystals, Clark and Lana follow in the hopes of finding it first. Clark finds an artifact that leads them to the crystal, but he must battle Isobel, the witch, who has once again inhabited Lana's body in order to take the crystal for herself. Meanwhile, Lex has more information on the crystals than he is letting on...

While driving, Lois accidentally hits a dog and brings it back to the farm to heal. Clark realizes this is no ordinary dog after the pup lifts up a car to retrieve a ball. Clark and Lois learn the dog is a product of an aborted LuthorCorp experiment and is being used to commit crimes, but when Lois is kidnapped by the robbers and Clark is weakened by kryptonite, it is up to the dog to save them. Meanwhile, Lana questions Jason's involvement in his mother's schemes...

In an effort to recruit Clark for their football team, Met U sends their star player Geoff to show Clark the "perks" of attending Met U. However, after one of Met U's players dies under mysterious circumstances and Lois is arrested for his murder, Clark discovers that Geoff has super powers and is using them to paralyze anyone who gets in his way -- including Lois. Meanwhile, Chloe continues to watch Clark to learn more about his secret...

Lana and Jason are attacked and almost killed by an unseen assailant and Alicia seems to be the prime suspect. Clark initially defends his new girlfriend, but when the evidence begins to pile up he is forced to take a hard truthful look at Alicia. Hurt by Clark's actions, Alicia forces Clark to unknowingly reveal his powers in front of Chloe. Meanwhile, Jason's mother returns to town with an offer for Lex...

Claiming to be cured, Alicia is released from Belle Reve hospital and comes to Smallville to rekindle her relationship with Clark. Initially skeptical of Alicia, Clark finds himself enjoying a relationship with someone who knows his secret, but when she pushes for more he hesitiates, causing her to use red kryptonite on him. "Bad Clark" emerges and whisks Alicia off to get married in Las Vegas. Meanwhile, Lana decides to have sex with Jason in order to win him back...

Lex's secret experiment at Luthorcorp goes awry and causes a dangerous toxin to be released into Smallville. Those infected by the toxin, including Clark, Lana, Lex, and Jason imagine their greatest fears come true and then fall into a coma. Desperate to find a cure, Clark gives some of his blood to Lex and is stunned at what Lex does with the antidote.

After Lex is accused of killing a young woman, Clark sets out to prove his innocence and turns to an unlikely source for help - Lionel. Swearing he is a changed man, Lionel offers Clark insight into the crime but he asks for something in return. Meanwhile, Lana meets Jason's parents and has a vivid flashback of the incident in Paris, leading her to suspect that Jason's mother was there when she got her tattoo...

After Lana reads from a spell book written in the 1600s, she, Lois and Chloe become possessed by witches that had been burned at the stake. The three witches have come back seek revenge and search for the powerful Kryptonian crystals, wreaking havoc on the town in the process. Clark attempts to stop the witches but they strip him of his powers and force him to reveal the location of the crystal he hid in the cave before the meeting.

Chloe is drawn into an underground gambling ring at school run by foreign exchange student Mikhail Mxyzptlk and loses her savings on a football game after Mxyzptlk uses his powers to control all the players -- including Clark. When Chloe discovers Mxyzptlk's secret, he kidnaps her and threatens to kill her unless Clark throws the championship game. Meanwhile, Lex threatens Mxyzptlk with deportation unless he uses his powers for Lex's benefit.

Clark hears a painful ringing sound in his ears and is drawn to the prison where Lionel is being held. When he sees Lionel attempt to stab Lex with a strange glowing stone, Clark grabs for the stone causing the two men to switch bodies. Learning his new body has super powers, Lionel immediately begins wreaking havoc on “Smallville”. Trapped behind bars without his powers, Clark must figure out a way to get his body and powers back in order to save his friends and family.

After Jonathan's wallet is stolen, Clark super-speeds after the thief but is stunned when he cannot catch him. The thief, Bart, a.k.a. The Flash later shows up at the farm and tries to talk Clark into leaving Smallville for a life on the road together, flexing their super powers. Meanwhile, Lex buys a priceless framed manuscript with Kryptonian symbols and Clark learns that it contains a mysterious hidden map. However, when Bart steals the manuscript from Lex, he inadvertently puts Clark's life in danger and must make the decision whether to save Clark or himself.

Clark joins the football team at school and is immediately given the starting quarterback position after the old quarterback starts a fight with new coach Jason. Curious about the behavior change in his old teammate, Clark and Lois investigate and discover that the cheerleaders are poisoning the teams' water with kryptonite, turning the players into Stepford-like boyfriends...

Clark faces a surprising new foe in the form of a shy high school girl who turns to plastic surgery to enhance her looks and boost her popularity. However, things go awry when she discovers that her kryptonite - enhanced beauty causes harm to anyone she kisses - and she decides her next victim will be Lana. Meanwhile, Jason and Lana continue to hide their relationship from Clark...

Clark and Lois Lane investigate Chloe's apparent murder, but are stopped by an army officer, General Sam Lane, who turns out to be Lois' father. Lois suspects that Sam knows more about Chloe's death than he will admit, and Clark discovers that Sam has recently been in contact with Lex. Jason arrives from Paris and convinces Lana to continue their relationship. Suspecting that Chloe is still alive, Lionel sends an assassin with the power to morph his limbs into metallic weapons to keep Chloe from testifying against him...

Clark returns to Smallville re-programmed as Kal-El. Intent on fulfilling his destiny, Kal-El takes to the skies to steal a powerful kryptonite crystal. Determined to save her son, Martha turns to Dr. Swann's emissary, Bridgette Crosby, and learns about a surprising new form of kryptonite. Meanwhile, Lois Lane comes to town to investigate the murder of her cousin Chloe. Also, Lana returns from Paris with a new attitude and a new boyfriend, Jonathan lies in a coma, and Lionel faces a grim new life in prison...

Things come to a head in Smallville when Kara, a beautiful girl with superpowers, who claims to be from Krypton, comes to entice Clark to fulfill his destiny. Overwhelmed, Clark turns to his parents for advice but is shocked when Kara forces Jonathan to finally reveal the deal he made with Jor-El. Also, Clark makes a discovery that ultimately redefines his relationship with Lex, and Clark's relationship with Lana takes a final turn...

Clark decides to tell Lana his secret so they can finally be together. Meanwhile, an errant FBI agent kidnaps and tortures Pete to try and force him to reveal Clark's secret. Also, Lex panics after the FBI gives him 24 hours to turn over information on his father or face jail time, but help arrives from an unexpected source...

When a Kiwatche Indian steals a mythic knife from the caves, he is bestowed with superpowers similar to Clark's, causing the young man to believe he is the legendary Naman, 'the man who fell from the stars'. Clark learns the Kiwatche legend foretold of a knife that could kill Naman and sets out to reclaim it before the young Indian can use it on Lionel...

Believing that key information about his father's past was lost when his memory was erased, Lex decides to join an experimental program with Dr. Garner to regain the information so he can turn his father over to the FBI. Knowing that Lex will discover his secret if he regains his memory, Clark tries to stop him but is caught by Lionel and the doctor and exposed to the same radical treatment so that Lionel can solve the mystery of Clark's past...

When Chloe accidentally inhales a mysterious krypto-gas, she discovers it acts as a truth serum to anyone who comes in contact with her and decides to take advantage of her new power by going to the Kents to find out Clark's secret. However, her new power comes with fatal consequences and Clark must find an antidote before she discovers the truth about him or worse, dies...

When Jonathan begins to act strangely, Clark believes Jor-El is sending Jonathan messages through the key and is the cause for his father's withdrawal from the family. Clark goes down to the caves to confront his biological father but Lionel catches him there and begins putting the pieces together - leading him straight to Dr. Swann. As the two billionaires face off, a deal is struck and Lionel's true motives are revealed...

Clark receives a panicked call from Lana and hears a gunshot before the line goes dead, but when he arrives at the Talon he is stunned to discover she is alive and well. Clark realizes the phone call came from the next day and that Adam is the one who will shoot Lana...

While his father is awaiting life-threatening heart surgery, Clark befriends a young boy, Garrett, whose brother Vince just died from liver failure. However, everyone is shocked when Vince shows up at the hospital alive and seemingly well -- until his liver starts failing again. In a desperate attempt to keep his brother alive, Garrett straps a Kryptonite bomb to himself and demands that Vince be given Jonathan's liver or he will blow up the building...

Clark is forced to use his powers in front of Alicia, a new girl at school, but he is surprised to find out she has powers of her own. The two develop a bond through their shared secret, but things turn ugly after Alicia becomes obsessive about sharing Clark with anyone else -- especially Lana. Meanwhile, Lana asks Lex to investigate Adam...

After Pete purposely blows a street race, the thugs that run it threaten his life, so he asks Clark to use his powers to stop them. Furious that Pete would put himself in this position, Clark must figure out a way to save Pete and still protect his secret. Meanwhile, Jonathan begins to suffer the consequences of his deal with Jor-El and Lex discovers that Adam's doctor is treating him with a dangerous experimental drug...

Clark discovers that his schoolmate Jordan can foresee the future, but is horrified when Jordan tells him he "sees" Lana dying in a fire in the next few days. Meanwhile, suspicious of his behavior, Chloe investigates Adam's background and discovers some disturbing news.

Clark and Lana each make an attempt on Chloe's life for unknown reasons after they receive a mysterious e-mail from the Sommerholt Institute. Clark must discover the source of these e-mails after Chloe reveals she has uncovered proof that they are doing mind-control research at the lab and realizes they must be trying to kill her in order to prevent her from writing an expose. Meanwhile, Lana decides to rent the apartment above the cafe to Adam even though she feels he is hiding something dangerous about his past...

Attempting to stop a robbery, Clark is temporarily blinded when he shoots off a burst of heat vision that is reflected back into his eyes by a piece of kryptonite. He soon realizes that his body has developed super-hearing to compensate for his lack of sight. However, as it was in the beginning with his other gifts, Clark doesn't quite have his new power under control...

Lex teams up with three krypto-villains to lure Clark to the hospital to enlist his help in escaping after he hears that Lionel has requested Lex be given electroshock therapy to erase his memory. However, the plan goes awry when the villains double-cross Lex and use kryptonite to steal Clark's powers. Meanwhile, Lana meets a mysterious new stranger in the hospital...

Lex locates Morgan Edge and gets him to admit to dirty dealings with Lionel, but before Lex can take it to the authorities, someone tries to kill him at the mansion. Barely surviving, Lex flees and asks Clark for help. However, when Clark returns to the mansion to investigate he finds nothing amiss, and begins to wonder if it really happened, especially after Lionel announces Lex has had a psychotic break and must be institutionalized...

Clark is suspicious when Lana suddenly becomes attracted to a fellow student and begins to act rebelliously, which eventually lands her in jail. Clark's suspicions are confirmed when he discovers Lana's new boyfriend has magnetic powers that can move objects and alter human emotions, but when he tries to free Lana from the paranormal hold that is controlling her, she tries to kill him...

Lana's great uncle, who was convicted of murdering his wife forty years ago, shows her a picture of the man he believes really killed her aunt, and she is shocked to discover the drifter looks just like Clark. Sure that the man is Jor-El, Clark's investigation leads him to a kryptonian medallion that allows him to see bits of the past and the life that Jor-El started for him long before he arrived on Earth...

Perry White, a once- promising journalist whose career was destroyed by Lionel Luthor, arrives in Smallville in search of alien stories for a tabloid news show. In spite of being constantly inebriated, Perry believes he has witnessed Clark using his extraordinary speed, so he devises a dangerous scheme to expose Clark's superpowers. Meanwhile, Lex learns that Perry has powerful incriminating evidence of Lionel's shady past...

Clark dreams he is being pursued by a frightened young girl who needs his help. However, after he discovers she is actually a comatose neighbor who should have woken up years ago, he enlists Lana's help to uncover the truth - which puts Lana in grave danger. Meanwhile, Lionel demands that Lex undergo a full psychological evaluation before he hires him...

Clark discovers someone is hunting people affected by the kryptonite rocks and the killer's next target is Lex. Clark uses his powers to save Lex, but is caught off guard when the killer learns his weakness and shoots him with a kryptonite bullet...

After Jor-El grants Jonathan temporary superpowers, he and Clark engage in a destructive battle atop the LuthorCorp building. Meanwhile, Lex returns home and must determine whether it was Lionel or Helen who arranged his plane crash...

Under the influence of red kryptonite and living in Metropolis, Clark gets involved with a crime lord named Morgan Edge who hires him to break into LuthorCorp. Meanwhile, desperate to put his family back together, Jonathan takes drastic measures to bring Clark home. At the mansion, Lionel accuses Helen of killing Lex...

A sense of foreboding surrounds Smallville as Clark must choose between staying with Lana and his family or fulfilling his destiny to rule the Earth. Lex and Helen plan their upcoming wedding, whilst a hurt Chloe considers Lionel's offer to investigate...

Dr. Walden wakes up from his coma and tells Lex & Lionel that Clark is an alien and must be destroyed. Meanwhile, a romantic encounter between Clark and Lana hints at a promising future...

After Lana is visited by the ghost of a childhood friend, she turns to Clark for help but he realizes the little girl is actually a kryptonite-enhanced clone, he rushes to save Lana before the revenge-seeking child harms her. Lex uncovers Lionel is responsible for the clone research...

Clark stumbles upon a robbery of a LuthorCorp truck carrying kryptonite and is stunned to realize he can't stop the thieves because they are as strong as he is. To keep Clark from going to the police, the thugs attack Jonathan and Martha...

After Lana is almost assaulted, Clark loses control and injures the boy - leaving the Kents open to be sued for punitive damages that could cost them the farm. Helen's ex-boyfriend arrives in town and stabs her, prompting Lex to take the law into his own hand...

Clark's new schoolmate uses heat-vision to prove that he's an alien, but Clark suspects he's not from his own planet - but from Krypton, instead. Meanwhile, Helen asks Lex some hard questions...

Determined to find out where he came from, Clark travels to New York to meet Dr. Swann, a brilliant scientist who holds a message for Clark from Krypton. Lana decides to move out of Chloe's house after the two girls get into another argument about Clark...

Clark rushes to find an antidote after Martha is infected with a toxic virus and falls into a coma, but when Clark also falls ill, it is up to Jonathan to find a cure in time. To further complicate things, Dr. Bryce demands an explanation from Jonathan when he refuses to let her treat Clark...

When Lex finds his long-lost brother Lucas, he brings him home in the hope that the two of them can unite against Lionel. A dangerous situation ensues, however, leaving Lex to wonder whom he can really trust. Clark decides to take a job at the Talon...

A strange parasite invades Chloe and Pete's body and feeds on the teen's adrenal glands, causing them to shake off their inhibitions and engage in wild and dangerous behavior. Meanwhile, Clark gathers his courage and asks Lana for a date, which she eagerly accepts. Before he is converted by "Red Kryptonite" by Pete...

When Lionel is shot, Jonathan is arrested, but after Clark and Pete perform their own crime scene investigation, they realize that more than one person had the opportunity to kill Lionel - including Lex. Meanwhile, Lana is suspicious after she asks her father to take on Jonathan's case and he declines for mysterious reasons...

After Lex discovers that Lionel installed cameras in the mansion, he hires some thugs to bug Lionel's office, but things get out of control when Lionel and Martha surprise the thugs and are taken hostage. Clark must figure out a way to save his mother without exposing his powers and sees his chance on an adjacent tall building - if only he could make the leap in a single bound...

Meanwhile Lana meets her estranged father Henry Small, while Clark and John have problems over Martha's new job working for Lionel.

Whitney returns home from the Marines looking to rekindle his relationship with Lana but his suspicious behavior prompts Clark to question his true motives. Lex becomes suspicious of his new girlfriend after he discovers a questionable photo of her with Lionel...

Clark falls into a cave and discovers two hidden treasures - ancient Indian writings that hold the key to his identity, and a beautiful girl whom he believes to be his soulmate. Desperate to preserve the writings, Clark enlists Lex's help to stop Lionel from demolishing the cave...

When Clark tries to warn Lana and Chloe about Ian, an overachieving student who is surreptitiously dating both girls, they realize too late that he was right. Meanwhile Lex loses his temper, landing him in an anger management class where he meets an interesting new woman...

Clark pushes his abilities to the limit to save his telepathic young friend Ryan from an evil doctor who wants to control the boy's abilities. Meanwhile, Nell tells Lana they are moving to Metropolis...

A mysterious woman shows up claiming to be Clark's mother, prompting the Kents to tell Clark what happened after they discovered him in the cornfield that fateful day. Clark discovers why his father hates the Luthor, how his adoption was fixed, and who really rescued Lex from death...

Martha goes to her estranged father for financial help. Clark is thrilled at the prospect of meeting his grandfather but Jonathan's refusal to see the man prompts Clark to force a reunion. Lana discovers an old photograph that suggests her father may still be alive...

Clark discovers someone has been leaving love notes for Lana at her parents' grave, whilst she follows the stranger to his home and discovers his parents keep him locked in chains. Clark and Lana break into the house to save him, but realize why he was locked up...

The school unknowingly uses red kryptonite in the class rings and its effect on Clark stuns everyone as he turns into a rebellious teenager who decides to use his powers for evil instead of good. Lana finds herself drawn to the "new" Clark who declares his love for her. Meanwhile Lex is at odds with his father about taking over his buisness.

After one of Clark's friends discover the spaceship in the cornfield, Clark goes against his parents wishes and reveals his secret, but is shocked when the reaction he gets makes him question his friend's loyalty.

Clark becomes frightened by his uncontrollable new gift of heat-vision, which allows him to start fires using his eyes, as this new found power sets his classroom and the Talon on fire. Jonathan then comes to the conclusion that his heat-vision occurs during thoughts of sex, as the first time he was watching a sex-educational video, while the second time, he was with Lana.
Meanwhile, Lex is seduced into marriage by Desiree Atkins, a woman who possesses Kryptonite-enhanced pheromones that can convince any guy to do anything. After she marries Lex, she attempts to have Jonathan kill him so she can inherit his wealth.

After Clark rescues Lana from the eye of the storm, he discovers the storm's wrath has unleashed the spaceship into the fields and buried his father alive along with the unscrupulous reporter who has discovered Clark's secret. Meanwhile, Lex is wracked with guilt over his father...

Clark finds the missing piece of the spaceship as Nixon continues investigating the Kents despite Lex's orders and finds the truth. Lex decides to counter his father's plans to shut down the fertilizer plant, whilst a tornado hits the town and its damage will effect everyone - especially Lana...

Clark and Lana race against time to find a kidnapped Chloe after a kryptonite explosion gives Lana the ability to "see" through the kidnapper's eyes and she watches Chloe being buried alive. Meanwhile, Lex discovers evidence that a spaceship landed in Smallville during the meteor shower...

Clark faces an unexpected foe when a gifted art student returns to school after a hit-and-run accident robbed him of the use of his hands but gave him the gift of telekinesis. Meanwhile, Lana becomes jealous after watching Clark with Chloe and begins to question her relationship with Whitney...

Clark sees the election for class president as an opportunity to be a "normal kid", but when his running mates are systematically attacked by a swarm of bees, Clark suspects a candidate is eliminating the competition one by one and he is next on the list...

Clark must stop a kryptonite-infected man who seeks to relieve the suffering of the elderly and sick by turning them into ashes - and Whitney's ailing father may be his next victim. Meanwhile, Lex is furious after his father sends someone to look into LuthorCorp's financial records and this man reveals Lex's secret investigation into Clark and his family...

After Martha accidentally hits a young boy with her car, the Kents take him in until they can locate his parents, unaware that the boy can read minds which puts Clark's secret in jeopardy. Meanwhile, Lex must decide if he wants to take his father up on his job offer...

Clark must solve the riddle of the mysterious Nicodemus flower and Lex's shady involvement after it infects the residents of Smallville removing their inhibitions - Jonathan becomes a couch potato, Lana puts the moves on Clark as the town Lolita and Pete tries to kill Lex - then puts them into a deadly coma...

Lex faces the consequences of his shady dealings in Metropolis years ago when an old enemy comes to Smallville intent on destroying his life, ultimately putting Clark and Lana in harm's way. Meanwhile, Clark has his hands full as he tries not only to protect Lex from the past, but also keep Chloe out of his after she discovers a mystery surrounding his adoption...

Clark and Lex are stumped when the Luthor mansion is robbed by burglars who seem to have the ability to walk through walls. Lex's curiosity turns to desperation when he discovers the thieves have stolen evidence of his secret project and Clark wonders if his dad was right about Lex's deceit all along.

When Clark rescues his classmate Eric from harm during an electrical storm, they are both struck by lightning, resulting in all of Clark's superpowers transferring to Eric. Clark is torn between happiness at finally being normal and growing concern as Eric starts to abuse his powers. Meanwhile, Lex believes he finally has undeniable proof of Clark's superpowers and confronts him...

Clark is stunned when a pesticide magnate who has kryptonite-enhanced powers of persuasion somehow convinces Jonathan to sell the family farm to make way for a new plant. Clark teams up with the local hermit whose mysterious past holds the key to the town's future...

A teen girl's obsession with Lex turns life-threatening when invisible attacks in Luthor Mansion pits Clark against an undetectable enemy. Meanwhile, Clark is thrilled when Lana looks to him for companionship after Whitney inexplicably pushes her away....

Clark's secret identity is at stake when a bad cop witnesses him use his superhuman powers and coerces Clark to join forces with him; however, when Clark double-crosses the cop, he is not prepared to deal with the consequences for him and his family. Meanwhile, Lex receives an intriguing proposal from an old British flame....