THE POWER OF DOPPELGANGERS – While Elena (Nina Dobrev) and Damon (Ian Somerhalder) try to explain Amara’s (Nina Dobrev) situation to Stefan (Paul Wesley), Dr. Wes (guest star Rick Cosnett) gives Katherine (Nina Dobrev) some deeply disturbing news. Nadia (guest star Olga Fonda) shows up at Caroline’s (Candice Accola) dorm room, searching for Katherine. After a surprising conversation with Amara, Jeremy (Steven R. McQueen) and Bonnie (Kat Graham) share a glimmer of hope. Silas (Paul Wesley) fails to keep a promise, causing Damon to turn to Tessa (guest star Janina Gavankar) for help with his new plan, and Stefan makes a heartbreaking confession to Damon and Elena. Leslie Libman directed the episode written by Rebecca Sonnenshine (#507).