The Vampire Diaries 4×22 “The Walking Dead” – As Graduation Day approaches, Caroline (Candice Accola) tries to distract Elena (Elena Dobrev) by focusing on simple tasks like sending out announcements, but Elena won’t be swayed from her new obsession. Sheriff Forbes (Marguerite MacIntyre) calls Damon (Ian Somerhalder) and Stefan (Paul Wesley) to the hospital, where someone has been attacking patients. Still trying to force Katherine (Elena Dobrev) to help her, Bonnie (Kat Graham) refuses to give up on her plan to defeat Silas. As a violent wind storm causes a power outage in Mystic Falls, ghosts suddenly appear — some with good intentions and some bent on revenge. Zach Roerig and Claire Holt also star. Rob Hardy directed the episode written by Brian Young & Caroline Dries (#422).