Watch The Vampire Diaries Online - Full Episodes

In the season finale, it's Founder's Day and Stefan is uncomfortable with Damon's new attitude toward Elena. However, Elena is more concerned about repairing her relationship with Jeremy, and Jeremy is worried about Anna. Johnathan Gilbert sets a plan in motion that brings Founder's Day to an end amid chaos, destruction and death.

Isobel returns to town and stuns Alaric with her attitude and her demands that he arrange a meeting with Elena. When mother and daughter finally meet, Isobel refuses to answer most of Elena's questions, but reveals that she will stop at nothing to find the mysterious invention Johnathan Gilbert has been searching for. Isobel's dangerous actions lead Stefan, Damon and Bonnie to step in and help Elena deal with the situation.

While Stefan struggles to come to terms with his past, both he and Damon reveal parts of their history to Elena, until she finally learns the truth about how they became vampires. Pearl has an ugly confrontation with Johnathan Gilbert. Damon and Alaric try to find a mysterious invention before Johnathan does. The friendship and flirtation between Jeremy and Anna continues to grow.

At the Founder's Day Gala, Elena and Caroline compete for the title of "Miss Mystic Falls" against other girls from town. Elena is happy to have Bonnie back in town, but Bonnie still has issues to work through. John Gilbert attempts to intimidate Damon. Damon discovers that Stefan is hiding a dangerous secret that could impact everyone in town.

Stefan tries to control his new situation; Jeremy and Elena receive a surprise visit from their uncle (David Anders); an incident at a party causes trouble between Tyler and Matt.

Stefan and Damon make a new enemy, which puts Stefan in a dangerous situation. Damon and Elena try to enlist Alaric's assistance in helping Stefan. Matt hopes that his mother may finally be back for good. Caroline's car breaks down during a storm, leading her to make a terrible discovery that shocks everyone in Mystic Falls.

Anna visits Damon and brings along an unexpected guest. Elena and Stefan endure an awkward double date with Caroline and Matt, but Stefan and Matt start to bond after realizing they share some common ground. Jenna reunites with her old friend Kelly, and Jeremy and Anna's relationship moves in a new direction.

Matt and Caroline are surprised by the sudden reappearance of Matt's mother Kelly. Stefan and Elena are worried about Damon's new attitude. Damon is asked by Sheriff Forbes to take part in a fund-raising bachelor auction. Alaric discovers shocking secrets from his own past. With help from Jenna and Stefan, Elena is determined to find out everything she can about her birth mother, but the truth may be more than she can handle.

Bonnie and Elena are saved from a danger by Stefan. Jeremy invites Anna to join him at a party unaware of Anna's ulterior motives. A shock is in store for all those who open a tomb.

In flashbacks, Stefan and Damon recall the long-ago actions taken by townspeople including their father, Guiseppe Salvatore, and Pearl, leading to the devastating events that caused the rift in their relationship. In the present, Bonnie's date with Ben takes a frightening turn. Elena helps Stefan as he and Damon race to find the missing journal that belonged to Elena's ancestor. Stefan learns the reason behind Alaric's interest in both the journal and the town's history. Damon discovers that an old acquaintance has returned to town with an agenda he understands.

Damon, Elena and Stefan attend the school dance with a 1950s' theme, where Alaric introduces himself to Damon. Stefan and Damon try to figure out the identity of the new vampire in town, Stefan gives Elena jewelry filled with Vervain to protect her family and friends. To make ends meet Matt takes a job at the Mystic Grill. Ben comes to help Bonnie when he notices Damon is bothering her.

Damon goes to Georgia, where he surprises an old flame, Bree and enlists her help to figure out how to open the tomb. Stefan opens up to Grams in his effort to help Bonnie overcome her fears and accept her powers.

After reading a journal kept by a Gilbert ancestor, Jeremy begins to sketch again -- a hobby he quit when his parents died. Sheriff Forbes notifies Damon of another attack and Damon offers to try to track down the killer. Alaric helps Jeremy, Tyler and Mayor Lockwood, while Elena makes a shocking discovery.

Jeremy gets a break from the new history teacher, Alaric Saltzman. He introduces Alaric to Jenna. Despite Elena's efforts to smooth things over, Bonnie and Caroline argue over the medallion. When the girls hold a seance to help them decide what to do, the results are stranger than any of them expected. Damon finally reveals to Stefan the reason he has returned to Mystic Falls.

On his birthday, Stefan (Paul Wesley) is surprised by a visit from Lexi (guest star Arielle Kebble, Gilmore Girls), one of his oldest friends. Damon's offer to help Sheriff Forbes (guest star Marguerite MacIntyre) has sudden and tragic results.

Stefan tries to save Vicki from herself. Damon tries to take his necklace back from Bonnie, he is shocked by Bonnie's powers. Bonnie discovers more about her family's history. Matt takes Vicki to a haunted house.

Elena seeks answers from Stefan about all the bad things happening in Mystic Falls. Stefan reveals how the rivalry with his brother began through a series of flashbacks. Damon controls Vicki's future. Meanwhile, Sheriff Forbes and Mayor Lockwood try to protect their town.

Elena and Jenna have a problem with Jeremy's relationship with Vicki. Stefan comes clean about his past to Elena. At a fund-raiser, Bonnie is taken aback by how advanced her powers are, and turns to her grandmother for guidance. Elena uncovers some news about the Salvatore family.

Elena and Stefan go to the town's annual Founder's Party. Vicki wants Tyler to take her to the party. Damon tells Elena about the history of the Salvatore's. Stefan tries to cut Damon out of his life.

Bonnie warns Elena about Stefan. Tyler attempts to humiliate Stefan but it backfires as Stefan catches and passes the ball back, winning everyone over. Damon and Caroline gate crash any plans Elena had for Stefan and Bonnie to get along

Mystic Falls begins the preparations to celebrate the passing of a comet. Vicki recuperates in the hospital from her injuries. Stefan uses his abilities to erase Vicki's attacker from her memory, but is interrupted by Matt. Mr. Tanner warns Aunt Jenna about Jeremy. Elena and Damon meet for the first time at the Salvatore house and his revelation on Stefan's past brings Elena closer to the truth. Damon finds his next victim in Caroline.

Mystic Falls begins the preparations to celebrate the passing of a comet. Vicki recuperates in the hospital from her injuries. Stefan uses his abilities to erase Vicki's attacker from her memory, but is interrupted by Matt. Mr. Tanner warns Aunt Jenna about Jeremy. Elena and Damon meet for the first time at the Salvatore house and his revelation on Stefan's past brings Elena closer to the truth. Damon finds his next victim in Caroline.