In the fourth season premiere, Elena awakens after the accident to find the thing she dreaded most has come true. Damon is furious with Stefan, and takes out his rage on Matt.

Stefan and Damon argue about what is best for Elena. Jeremy and Matt are surprised to see a girl they used to know, April (GRACE PHIPPS), enrolling at Mystic Falls High.

Elena learns confronting Rebekah (CLAIRE HOLT) can be dangerous. Tyler gets a surprise visit from Hayley (PHOEBE TONKIN - The Secret Circle), a werewolf who helped him with Klaus.

At a fraternity costume party, Damon gives Elena a lesson in choosing a victim. Klaus reveals an encounter with a group of vampire hunters - flashing back to 12th century Italy.

Stefan and Klaus form an uneasy alliance to try and contain the danger that Connor (TODD WILLIAMS) has unleashed. Professor Shane (DAVID ALPAY) works with Bonnie.

Terrifying hallucinations leave Elena shaken and confused and she makes a painful confession to Stefan. Matt gives Damon startling information about Professor Shane (DAVID ALPAY).

At the annual Miss Mystic Falls Pageant, Elena and Caroline give April (GRACE PHIPPS) advice, while Tyler and Hayley (PHOEBE TONKIN) work together on a secret project.

Damon and Stefan visit New Orleans in hopes of finding someone who remembers their last visit in 1942. MADELINE ZIMA (Californication) guest stars as one of Damon's former flames.

It's a winter wonderland in Mystic Falls. Plus, Professor Shane (DAVID ALPAY) reveals a piece of ancient history that leaves everyone speechless.

Rebekah (CLAIRE HOLT) is back with a vengeance. Bonnie is uncomfortable when her father, Rudy Hopkins (RICK WORTHY - Supernatural), accepts the role of Interim Mayor.

Jeremy is furious when Klaus tries to control him by putting Matt's life in danger. Damon coaches Jeremy as he prepares to take on Klaus' new vampires, but they find that Kol has beaten them to it. Kol makes it clear that he will stop at nothing to convince everyone to give up the search for the cure. Looking for a new ally, Rebekah reminds Stefan that they were once close friends. When Sheriff Forbes and Mayor Hopkins question Shane about his involvement in the Founders' Council deaths, Bonnie steps in with questions of her own, and Shane's responses push Bonnie to the edge of her powers. Elena negotiates with Klaus to keep Jeremy safe, but when danger suddenly appears from a totally unexpected enemy, Elena comes up with her own daring plan for Jeremy.

When the 1980s Decade Dance at the high school is cancelled by Mayor Hopkins (RICK WORTHY), Stefan finds a charming way to make it up to a disappointed Rebekah (CLAIRE HOLT).

Shane (DAVID ALPAY) leads an expedition to a desolate island, where he believes the secret of the cure lies hidden. Rebekah (CLAIRE HOLT) and Elena continue their bitter rivalry.

Damon has an ugly run-in with a Hunter, Vaughn (CHARLIE BEWLEY - The Twilight Saga), and realizes he is one of the Five. Stefan admits his feelings about possibly becoming human.

Damon and Rebekah (CLAIRE HOLT) learn an unexpected bit of recent history from Vaughn (CHARLIE BEWLEY). Bonnie reveals the rest of Shane's (DAVID ALPAY) plan.

Elena's new outlook has everyone concerned. Damon and Rebekah (CLAIRE HOLT) work together, but his unwanted advice catches her off-guard. Klaus tries to use Hayley (PHOEBE TONKIN).

Realizing that Elena needs some time away from Mystic Falls, Damon takes her to New York City. Flashbacks reveal Damon's hedonistic life there in the 1970s.

While in a small town in Pennsylvania with Rebekah (CLAIRE HOLT), Elena has a surprising encounter with Elijah (DANIEL GILLIES). Klaus receives Caroline's reluctant help.

When Caroline's plans for the perfect Senior Prom night are disrupted by Elena, she turns to an amused Klaus for a solution. Bonnie makes a terrifying discovery.

Klaus returns to his past in New Orleans and meets with his former protégé, Marcel (CHARLES MICHAEL DAVIS), a charismatic vampire with control over the city's inhabitants.

The Salvatore brothers ask for backup from a surprising source when Elena calls their bluff. Katherine is suspicious when Bonnie makes her an offer.

Someone has been attacking patients at the hospital. A violent wind storm causes a power outage and ghosts suddenly appear - some with good intentions and some bent on revenge.

Season finale: It's Graduation Day. Damon's life is in danger and Elena faces an epic confrontation. Plus, Stefan discovers a horrifying clue to the mystery surrounding Silas.