Castiel (Misha Collins) helps Sam (Jared Padalecki) and Dean (Jensen Ackles) hunt down Cupid (guest star Lex Medlin) on Valentine's Day after townspeople start to kill each other for love. However, after Cupid tells them he's innocent, they discover Famine (guest star James Otis), one of the Four Horsemen of the Apocalypse, has arrived in town.