KATHERINE’S PAST IS REVEALED — Elena (Nina Dobrev) puts herself in a dangerous position as she searches for the truth about Katherine’s past and what her own future may hold. Knowing that Stefan (Paul Wesley) would never agree to her plan, Elena swears Caroline (Candica Accola) to secrecy. Damon (Ian Somerhalder) uses a new-found confidant to help him try to discover the real purpose and power of the moonstone. Jeremy (Steven R. McQueen) and Bonnie (Katerina Graham) meet Luka (guest star Bryton James), a new student with a surprising family history.