Twiggy The Muppet Show : Season 1 Episode 19

Kermit is skeptical when everyone backstage is terrorized by “the Phantom of the Muppet Show” aka Uncle Deadly, a monster-actor who performed in the theater years ago, got panned by the critics, and vowed never to perform there again, and not to let anyone else perform either warning the Muppets “Leave or be doomed!”