20 Stars Who Appeared on "Buffy the Vampire Slayer"19 of 40
Nathan Fillion
Fillion is perhaps still best known to some as Captain Mal from Joss Whedon sci-fi series "Firefly." But in the middle of its criminally-short 14-episode run, Fillion also appeared in Whedon’s vampire show as creepy priest Caleb. The actor starred in the final five episodes of "Buffy" as the sadistic sociopath, and came to a very sticky end at the hand of the slayer. Fillion would go on to star in more than 170 episodes of comedy crime-drama "Castle."
Fillion is perhaps still best known to some as Captain Mal from Joss Whedon sci-fi series "Firefly." But in the middle of its criminally-short 14-episode run, Fillion also appeared in Whedon’s vampire show as creepy priest Caleb. The actor starred in the final five episodes of "Buffy" as the sadistic sociopath, and came to a very sticky end at the hand of the slayer. Fillion would go on to star in more than 170 episodes of comedy crime-drama "Castle."