Stefan's brother Damon enters the picture; they have not seen each other for 15 years.
Mystic Falls begins the preparations to celebrate the passing of a comet.
While giving Bonnie her witch costume at school, Caroline also gives Bonnie the amber crystal which Damon took from the Founder's Party.
At a Halloween party at the school, Vicki attacks both Jeremy and Elena, and Stefan is forced to stake her through the heart, killing her.
Damon also retrieves an amber crystal from one of the historical artifacts in the Lockwood Estate.
Meanwhile, Stefan uses Caroline as a vessel to poison Damon. Once Caroline wakes up, she sees the amber crystal and puts it in her purse unaware of its power.
The Vampire Diaries is an American supernatural horror romance television series created by Kevin Williamson based on the novels of the same name by author L. The series focuses on the fictional town of Mystic Falls, Virginia, that is charged with supernatural history.