During a contract dispute in season 5, the role of Angel was played by a Muppet.
Angel was a television series on The WB, created by Joss Whedon, about a centuries-old vampire with a soul, an immense forehead, and truly excellent hair. The title character, former age-inappropriate boyfriend of Buffy the Vampire Slayer, was frequently unhappy, probably because a curse prevented him from having sex. Honestly, wouldn't you be pretty upset about a thing like that?
Angel reached the height of its creative powers in its fifth season, drawing excellent ratings and well-deserved praise from critics and viewers alike for its biting wit and compelling storyline. In a peerless masterstroke of programming brilliance, The WB promptly cancelled it.