Caleb

Caleb (played by Nathan Fillion) is a fictional character in the Buffy the Vampire Slayer fictional universe created by Joss Whedon.

Caleb is an arrogant, misogynistic defrocked priest who is allied with The First Evil and serves as one of the "big bads" of Season 7. Prior to becoming a servant of the First Evil, Caleb was a killer responsible for the deaths of at least two girls, whom he lured sometimes with his sermons and his priest's collar. Among his victims was a showgirl in Nashville and a girl named Betty.

Trivia

 * Nathan Fillion is one of three actors who had appeared on Whedon's Firefly series who later played a villain on one of Whedon's other shows.