I tredje sæsons åbningsafsnit er det Elenas 18 års fødselsdag. Mens hun leder efter spor af, hvor Stefan er, prøver Damon at holde Elena fra at henlede Klaus’ opmærksomhed.

Damon and Alaric reluctantly go along with Elena's new strategy to find Stefan, leading Damon into a dangerous fight with an unexpected enemy.

Klaus and Stefan arrive in Chicago, where Stefan is reunited with a vampire (recurring guest star CLAIRE HOLT – Pretty Little Liars, H20: Just Add Water), who hasn't really moved on from her interest in him decades earlier. In a flashback to Chicago in the 1920s, Stefan comes face to face with a shocking chapter from his wild past. After Damon gets a tip on Stefan and Klaus' whereabouts from an...

Stefan suddenly finds himself in danger.

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 d...

På første skoledag kæmper Elena, Caroline, Bonnie og Matt stadig med efterdønningerne af de seneste begivenheder. Imens fortsætter Stefan med at udføre sin seneste opgave for Klaus.

Mens de forbereder sig på at fejre den traditionelle Lysaften, invaderes Mystic Falls af de dødes ånder. Efter et voldsomt møde med en vred ånd, beder Damon Bonnie om hjælp.

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 b...

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 danger...

Tyler faces consequences of his actions as a hybrid.

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 aga...

PERSIA WHITE guest stars as Bonnie's mother.

Sheriff Forbes (MARGUERITE MacINTYRE) delivers disturbing news to Alaric and Elena about a recent murder weapon, and Caroline is heartbroken when unable to stop a tragedy unfold.

Elena inviteres til et fint bal og opdager en gruopvækkende plan, der kan føre til en lang række dødsfald. Hvem kan hun stole på med sine nye oplysninger?

Da Elijah (DANIEL GILLIES) giver Damon og Stefan et farligt ultimatum, der bringer Elena i fare, henvender de sig til Alaric og Meredith (TORREY DeVITTO) for at få hjælp.

Mordene i Mystic Falls minder Damon om en lignende mordrus et århundrede tidligere, og han mindes den smukke vampyr Sage (CASSIDY FREEMAN), der viste ham et nyt perspektiv.

Damon bliver overrasket over, hvorfor Sage (CASSIDY FREEMAN) er tilbage, og glad, da hun udtænker en metode til at hjælpe ham med at regne ud, hvad Rebekah (CLAIRE HOLT) har på færde.

Stefan's emotional turmoil leads him to a dangerous confrontation with Klaus and, later, to a heartbreaking moment with Elena. CLAIRE HOLT and CASPER ZAFER guest star.

Caroline bliver begejstret, da Tyler vender tilbage til byen, men Tyler fatter snart mistanke om, at noget har stået på mellem Caroline og Klaus.

1920'er-ballet tager en dødelig drejning, da Damon og Stefan indser, at de behøver hjælp fra Matt, Jeremy og især Bonnie for at ophæve en besværgelse, der kan vise sig ødelæggende for alle.

Klaus vil handle efter sine hensigter om at forlade byen med Elena, men får modstand fra en overraskende ny fjende. Damon og Stefan har en overraskende åbenhjertig samtale om fremtiden.

I tredje sæsons finaleafsnit træffer Jeremy, fast besluttet på at beskytte sin søster, en beslutning, som ændrer alt. Bonnie indgår en hemmelig aftale, der får hjerteskærende konsekvenser.