Here's a look at tonight's sci-fi TV:
Supernatural, "My Bloody Valentine" – After a string of Valentine's Day murders, Sam, Dean and Castiel pin the crimes on Cupid, who turns out to be a schlubby and grabby half-naked manchild, naturally. But is Cupid at fault, or is one of the Four Horsemen of the Apocalypse to blame for the deaths? (My money's on the Horseman.) (9 p.m. ET on The CW)
The Vampire Diaries, "Fool Me Once" – The tomb opens tonight as Damon asks Stefan to help him save Elena. What's inside the tomb? I'm hoping it's a magical portal that'll lead Ian Somerhalder back to the island and away from this kiddie creep show. (8 p.m. ET on The CW)
Head after the jump for clips and more TV picks.