Sheriff Forbes delivers disturbing news to Alaric and Elena about a recent murder weapon. Caroline is heartbroken when she's unable to stop a tragedy.
Bonnie believes her recurring dreams about Klaus' coffins will tell her how he can be killed. The dreams also lead Bonnie to a reunion with her mother, Abby (recurring guest star PERSIA WHITE – Girlfriends), whom Bonnie hasn't seen for 15 years. At Abby's
remote farmhouse, Bonnie and Elena meet Jamie (guest star ROBERT RI'CHARD – One on One), the young man Abby took in years earlier. Bonnie's sudden appearance catches Abby off guard, but she does her best to explain the past. Tyler turns to an unexpected ally in his quest to regain his free will. Damon is intrigued by Alaric's new friend, Dr. Fell (recurring guest star TORREY DeVITTO), and
Klaus continues his bitter negotiations with Stefan over control of the coffins containing his family members.
Although Caroline is in no mood to celebrate her 18th birthday, Elena, Bonnie and Matt surprise her with a small party in an unusual location. Damon and Stefan disagree on the best way to handle Klaus, and a reckless Stefan decides to test his theory by taking things to dangerous extremes. Bonnie is concerned when Elena tells her about Jeremy's new plans. At a Founder's meeting, Alaric once again runs into Dr. Fell (recurring guest star TORREY DeVITTO), who is in the middle of an argument with her ex-boyfriend, the medical examiner (guest star DAVID COLIN SMITH). Tyler refuses to go along with Klaus' latest demand, and is surprised when Klaus seems to accept his decision.
Stefan has hidden the coffins containing the bodies of Klaus' family, and Klaus quickly turns to violence to convince Damon and Elena that no one will be safe until he finds Stefan and gets his family back. Tyler continues to make the most of his new abilities as a hybrid, but he has to face the disturbing consequences of his actions as well. After a terrifying incident, Elena and Alaric grow increasingly concerned about Jeremy's attitude and, ultimately, his safety. Alaric meets the beautiful Dr. Fell (recurring guest star TORREY DeVITTO – Pretty Little Liars), who is intrigued with his amazing ability to heal. While trying to strike a deal with Klaus, Elena delivers news that truly shocks him. Also in the episode, Internet personality JUSTINE EZARIK appears as a bartender.
On the night of the Homecoming dance, Rebekah (recurring guest star CLAIRE HOLT) opens up to Elena about why the evening is so important to her, leaving Elena with conflicting emotions. Caroline and Matt are both shocked at Tyler's behavior throughout the evening. The night takes a surreal turn when Klaus puts his latest plan into action. Determined to outsmart Klaus, Damon enters into a dangerous partnership, leading to a terrifying turn of events. The band MY MORNING JACKET performs in the party scenes.
With help from Elena and Bonnie, Alaric tries to decipher the meaning behind his recent discovery. Elena and Rebekah (recurring guest star CLAIRE HOLT) engage in a mean-girl power struggle, until Rebekah finally reveals some of her family?s ancient secrets and the violent past she shares with Klaus and Elijah (recurring guest star DANIEL GILLIES). Damon tries a reckless new approach to make a breakthrough with Stefan, and they?re both surprised by an unlikely ally.
Preparing to celebrate Illumination Night, Mystic Falls is invaded by spirits. After an encounter with an angry spirit, Damon asks Bonnie for help.
As senior year begins, Elena, Caroline, Bonnie and Matt are reeling from recent events, while Stefan carries out his latest assignment from Klaus.
Despite all that has happened, Caroline is determined to see that Elena, Bonnie, Matt and Tyler all enjoy a traditional Senior Prank Night before the school year begins at Mystic Falls High School. However, when uninvited guests show up, it doesn't take long for the evening to take a deadly turn. Damon convinces Jeremy that he can use his new connection to the other side to help find a way to defeat Klaus. Finally, Klaus deepens his hold on Stefan and uses him for increasingly violent and dangerous purposes.
A frustrating new enemy pushes Damon over the edge, and his outburst has lasting consequences. Bonnie's strange encounter affects everyone.
Stefan reunites with a vampire from decades earlier. In a flashback to the 1920s, he comes face-to-face with a shocking chapter from his wild past.
Damon and Alaric reluctantly go along with Elena's new strategy to find Stefan, leading Damon into a dangerous fight with an unexpected enemy.
It's Elena's 18th birthday, and as she searches for Stefan, Damon tries to keep her from doing anything that might draw Klaus's attention.
More than one life hangs in the balance as the consequences of the sacrifice ritual play out to a horrifying conclusion.
As the full moon arrives, Elena prepares for whatever Klaus has planned and Tyler faces his second transformation.
Damon is willing to go to great lengths to prevent Elena from being a victim of Klaus's plan to break the curse, putting him at odds with Stefan.
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