“The Vampire Diaries” (8 p.m., The CW): Season 2 of “The Vampire Diaries”

“The Vampire Diaries” (8 p.m., The CW): Season 2 of “The Vampire Diaries” picks up with Elena (Nina Dobrev) discovering the bloody body of her Uncle John, and Damon (Ian Somerhalder) realizing that evil vamp Katherine has returned.

TV Listings, B6