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Sacrifices will be made and both universes may never be the same again after Walter and Olivia visit the "other side."

Walter and Olivia travel to the parallel universe, and the anticipated face-off between Walter Bishop and William Bell occurs.

While Peter and a local sheriff investigate murders tied to Newton, Walter is worried that he'll be sent back to St. Claire's, and someone new arrive from the other Earth.

While Walter deals with some very upsetting news, he tells Olivia's niece, Ella, a fairy tale that includes musical performances by Olivia and Agent Broyles.

When two teenagers on a date turn up 'dead' at an abandoned warehouse with the three puncture wounds to the soft palate - a trademark of the shape-shifters - the Fringe team investigates the evidence as well as the motives of mastermind Newton. Meanwhile, Peter reveals a family secret to Olivia as Walter struggles to recall what Newton knows about 'building a door'.

When passengers aboard a commuter train appear to have died a still death, it seems that a switch was flipped because all cell phones, mp3 players, laptops, batteries and bodies have been drained of power. As the Fringe team assembles at the bizarre crime scene, Peter remains suspicious that something is amiss with Walter.

While Olivia struggles to keep Walter's newly-revealed secret from Peter, the team investigates a woman inexplicably struck down by a fatal disease she's never had.

Walter flashes back to 1985 while explaining Peter's otherworldly origins to Olivia. Also, Peter's mother is introduced and details of the neighboring world reaffirm that there is more than one of everything.

When the sole survivor of a building demolished by an earthquake in downtown Manhattan proves to be from the other Earth, Walter leads the team to Jacksonville, the source of a related experiment that he and William conducted years ago. Now only Olivia and the secrets of her past can prevent another catastrophe.

Unseen killers target a wedding with a toxin that targets specific individuals, and Walter discovers that the case may be tied to a branch on the Bishop family tree.

While investigating a case in an office building where a man's blood literally burst from his arteries and veins, Peter and Olivia are trapped in a CDC quarantine when it's discovered that the blood carries a deadly pathogen.

The Fringe team travels to the town of Edina to investigate a cover-up and are greeted with hostility by the locals. They discover that many of the residents are disfigured, but have managed to hide their deformity... and will to go to any lengths to ensure their secret.

A teenage girl awakens after an incident leaves her brain-dead... but she now insists that she's a Russian soldier.

The Fringe team investigate a mental institution after a patient has brain surgery and begins to show an improvement despite having his brain exposed. Agent Dunham makes a discovery of her own after seeing footage from the surveillance tapes.

The Fringe team investigate bodies with creatures attached to it. Olivia, Peter and Broyles discover that the case is linked to a dangerous organization.

The Fringe team closes in on the mysterious Observer after they investigate a bizarre abduction case in Boston, MA.

The Fringe Division investigates an unusual kidnapping with connections to Massive Dynamic.

The Fringe team investigates instances of victims being transformed to ash by high-energy discharges, and discover a connection to Broyles' past.

A man attacks his boss after a disturbing dream and the team travels to Seattle to investigate. Meanwhile, Broyles needs to meet with Nina Sharp.

Agent Dunham, still recovering from her traumatic visit to the alternate reality, is given a concoction by Walter to help her remember. Another woman being experimented on by Walter is introduced. Meanwhile the Fringe team look into a series of robberies that are linked to shapeshifting.

Peter, Olivia, and Walter race against time to investigate the bombing of a train station. Walter discovers something unusual about the human remains.

The Fringe team travels to Pennsylvania to investigate an underground tunnel full of human remains. Meanwhile, Walter experiments using frogs to travel between realities.

Season Two opens with Olivia's shocking return to this perplexing alternate reality, while Peter, unknowingly in a race against time with an ominous mobile force, pursues information about Olivia’s visit. Walter reenters the lab to cook up a bit of fringe science, and of course, some custard for Peter’s birthday.

The sudden and unexpected attack on someone with close ties to Fringe Division, the return of bioterrorist David Robert Jones and the inexplicable disappearance of Walter set the stage for a non-stop, nail-biting season finale. Questions will be answered, observations made, loyalties tested and truths and identities revealed.

First her bad dreams became reality, and now Olivia is "dreaming" while awake, seeing elaborate bleak visions of things not really there. While investigating the disturbing case of a woman who apparently spontaneously combusted, Olivia throws caution to the wind and mines her unexplained visions for clues. Meanwhile, Walter comes clean about his prior knowledge of the Z.F.T. manifesto, and Peter's secret project is revealed and yields surprising help in unraveling the mystery.

Someone is killing people and draining their spinal cord fluid. Olivia, Peter, and Walter go to great lengths to stop the deaths, which are happening more and more frequently.

Olivia dreams about a suicide as the event really happens at Grand Central Station; shocking information about the ZFT manuscript is revealed.

As animal rights activists ransack a laboratory, they get more than they bargained for when one of the caged “animals” unleashes a ferocious appetite. Leaving grotesquely mutilated dead bodies in its wake, the scientific engineered beast – with the body of a lion, claws of an eagle, fangs of a viper, skin of a rhinoceros and tail of a serpent – attacks Charlie. With Charlie’s life on the line, Walter must come face-to-face with both his past and the beast.

While dealing with a serial killer from her past, Olivia bonds with a mysterious mute child.

German agents question Olivia about her relationship with David Robert Jones, an escaped prisoner questioned months earlier now living in the U.S. Meanwhile, the Fringe Division investigates a threatening case where victims die faceless from their orifices suddenly sealing. With few leads and many questions, German authorities turn to Olivia, Peter and Walter to help makes sense of the return of Mr. Jones and the foreboding mysterious occurrences. As the investigation unfolds, Olivia is put to the test.

When bizarre twisted remains are found among the debris of a crashed jumbo jet, Olivia and Peter end up going undercover as part of their investigation.

A trial of deaths across the country has a consistent pattern: in each case, the victim's brain has been liquefied.

Broyles puts Agent Mitchell Loeb in charge of the task force assigned the missing Agent Dunham... unaware of the role Loeb has in her disappearance.

The team is called in on a bank robbery similar to other robberies in the area but this particular bank has the thief embedded inside the steel wall of the bank. Somehow the thieves have found a way to defy the law of physics. Walters thinks their after something of his. As the investigation deepens it all comes to a head when the thieves ambush one of the team.

The team is called in to investigate why a man jumps out a window because he thinks he's being attacked by butterflies. Olivia gets some breaks in solving the case from her former partner and that she is so desperate to rid herself of him that she demands to go back into the tank. Meanwhile, some former friends and current foes of Peter find out that he's back in Boston.

Walter's former bunkmate at the mental institute is linked to the abduction of a young musical prodigy by a serial kidnapper. Peter is concerned when Walter insists on going back to the mental institute to solve the case.

A parasite mysteriously latches onto a dying FBI agent's internal organs. Agent Dunham rushes to Germany to meet a prisoner for information about the threat they face.

After weeks of being reported missing, a woman with a rare disease resurfaces in suburban Massachusetts and inexplicably causes excruciating pain and subsequent death to those she encounters. As the gruesome scene is investigated, dangerous levels of radiation are detected, and unusual circumstances surrounding the case point to illegal human drug trials and possibly something even more sinister. Meanwhile, Walter obsesses about cotton candy, Peter strikes a bargain with Nina Sharp and a startling piece of Olivia's past is revealed.

A deliveryman discovers he has the ability to control electrical devices and discharge current, leading to an elevator crash. Walter recognizes the accident as caused by someone who has undergone electrical augmentation, similar to a project he conducted using homing pigeons. Meanwhile, Olivia gets a visitor from her past.

Broyles calls in the team to investigate a deadly explosion and its source: a strange cylinder unharmed despite the destruction. Olivia determines that the same cylinder, or a similar one, is responsible for similar events in widely diverse locations.

A bizarre incident on a bus leaves the passengers asphyxiated in transparent silicon, and the only "witness" is a man who is psychically linked with the individual responsible.

The trio's unlikely partnership develops as they investigate the death of a woman who conceives, has a full-term pregnancy, and gives birth all within a few hours. After the birth, the baby ages to 80 years old and dies in only a few minutes. While the team looks into this bizarre event, Dr. Bishop begins testing in his lab.

Special FBI Agent Olivia Dunham is part of the team called in to investigate when Flight 627 lands with everyone on board dead: their flesh liquefied. When her partner and lover is contaminated by a similar chemical that crystallizes his skin, Olivia discovers the one man who can help has been institutionalized for twenty years.

Interviews with the cast and executive producers of Fringe