Warning! Vampire Diaries spoilers for Season 5, Episode 1, “I Know What You Did Last Summer” below!

School’s back in session for all the kiddos across the land, and for The Vampire Diaries’ college students. The CW show returns tonight, October 3, at 8 p.m. ET and you're going to want to check out the synopsis for Season 5, Episode 1, “I Know What You Did Last Summer.” Do with it what you will!

Summer is over, but Damon (Ian Somerhalder) and Elena (Nina Dobrev) are still going strong. Before she leaves for Whitmore College, the freshman vampire wants to make sure Jeremy (Steven R. McQueen) is all settled in after his trip back from the land of the dead. Isn't that what big sisters are for? It sounds like Elena compelled herself more than just a place at the university, because Caroline (Candice Accola) is her roommate. Prepare for some adorable — and sometimes sexy — Delena action before she heads off to get her learning on.

The girls expect Bonnie (Kat Graham) to join them at Whitmore. (The witch has been “traveling” all summer, which is code for “dead and living in another realm.”) Instead, they find another student named Megan (Hayley Kiyoko) in their dorm.

Katherine (Nina Dobrev) is human and in need of companionship. She shows up at the Salvatores’ and tries to make Damon her personal bodyguard.

Two people who really have been traveling, Rebekah (Claire Holt) and Matt (Zach Roerig), trade Europe for Mystic Falls. On their voyage, the couple met Nadia (Olga Fonda), who’s beautiful but mysterious.

Stefan (Paul Wesley) continues to drown in his underwater prison, and Elena senses something is wrong with her ex. Her suspicions will likely be confirmed at the “End of Summer” party (Mystic Falls event alert!), when Silas scares everyone half to death and makes them wonder when Stefan got to be such a jerk.

Check out the full synopsis below!

"After spending the summer enjoying her passionate relationship with Damon (Ian Somerhalder), and making sure that Jeremy (Steven R. McQueen) is adjusting after his return from the dead, Elena (Nina Dobrev) is thrilled to move into the dorm at nearby Whitmore College with her new roommate, Caroline (Candice Accola). Still believing that Bonnie (Kat Graham) has been traveling all summer and will soon join them, Elena and Caroline are surprised when a student named Megan (guest star Hayley Kiyoko) shows up and announces that she will be sharing their dorm room. Katherine (Nina Dobrev) makes an unexpected appearance at the Salvatore house and pleads with Damon to help her now that she is human and vulnerable to her enemies. Matt (Zach Roerig) and Rebekah (Claire Holt) return to Mystic Falls after spending a wild summer in Europe, where they met a mysterious beauty named Nadia (guest star Olga Fonda). Elena can’t shake the feeling that something is wrong with Stefan (Paul Wesley), and Silas (Paul Wesley) makes a terrifying appearance at the “End of Summer” party in the town square."

Carson Blackwelder is an Assistant Editor at Wetpaint Entertainment. Follow him on Twitter and Google+!