"The Birthday" is the first episode of the third season of The CW television series, The Vampire Diaries and the 45th episode of the series overall. It originally aired on September 14, 2011. The episode was written by Kevin Williamson and Julie Plec and directed by John Behring.

Stefan (Paul Wesley) is now with Klaus (Joseph Morgan) after promising him that he will do whatever Klaus tells him to do as exchange for saving his brother. The two of them try to find werewolves and track down one of them, Ray (David Gallagher). When they get to his house, two women are there. Klaus forces them to tell him where Ray is and then orders Stefan to kill both of them.

Caroline (Candice Accola) organizes a birthday party for Elena (Nina Dobrev) despite Elena's wish not to have a party. Elena tries, with the help of Caroline's mother, to follow Klaus’ victims so she will find where Stefan is. Damon (Ian Somerhalder) also tries to track down where Stefan and Klaus are with the help of Alaric (Matt Davis) but they do not tell Elena about their progress.

Jeremy (Steven R. McQueen), since the moment Bonnie (Kat Graham) brought him back to life, keeps seeing the ghosts of Anna (Malese Jow) and Vicki (Kayla Ewell) but does not tell anyone about it. Later, at the birthday party, he tells Matt (Zach Roerig) that he sees things he should not see but does not clarify what. When the two of them head back home, Matt hears him calling Vicki's name and realizes what Jeremy was talking about earlier.

Caroline and Tyler (Michael Trevino) grew closer during the summer but they are not together, as Caroline declines Tyler's proposal to be together. Tyler arrives with a date to Elena's birthday party, something that makes Caroline jealous and she ends up kissing him. The two of them go to Tyler's place and after having sex, Caroline tries to sneak out. Tyler's mother, Carol (Susan Walters), who suspects that Caroline must be a vampire, catches her on her way out and when Caroline tries to get her bag she burns out from vervain. Carol shoots her with more vervain injections and Caroline collapses.

Damon and Alaric go to the werewolf's house after their last clues about where Stefan and Klaus might be, and find the two girls dead with their heads ripped off. Damon explains to Alaric that Stefan was the one who killed them as that is his signature and that is why he got his nickname, "The Ripper".

Meanwhile, Klaus and Stefan find Ray and they torture him to tell them where the rest of his pack is. When Ray finally does, Klaus feeds him his blood and kills him to turn him into a hybrid. In the meantime, Klaus finds out that Damon still follows them, trying to find Stefan. Stefan overhears, and tells Klaus that he will handle his brother. Stefan finds Andie (Dawn Olivieri) in the TV news studio and when Damon gets there, Stefan tells him to stop searching for him. To make it clear, he compels Andie to jump off the roof. Andie dies, Stefan returns to Klaus and Damon goes home where Elena waits for him. Elena finds out that Damon was hiding things from her about Stefan. When she asks for an explanation, Damon tells her that she should forget about Stefan and that the victims they were tracking all this time were not Klaus’ but Stefan's; this is why he did not want to tell her.

Stefan calls Elena, but when she picks up the phone, he does not speak. Elena realizes that is Stefan and tells him to hold on, that everything is going to be fine and that she loves him.

In "The Birthday" we can hear the songs:^[1]

• "A Drop in the Ocean" by Ron Pope
• "What You Know" by Two Door Cinema Club
• "Make It Without You" by Andrew Belle
• "Are We There Yet?" by Ingrid Michaelson
• "Barton Hollow" by The Civil Wars
• "Hello" by Martin Solveig
• "You Make Me Feel..." by Cobra Starship
• "Starpusher" by Location Location
• "Hawk Eyes" by The Kicks
• "Anna Sun" by Walk the Moon