Gaffer is the bedraggled, one-eyed cat who was frequently seen hanging around backstage in the later seasons of The Muppet Show. The cat was introduced in episode 419. Performer Kathryn Mullen spoke of the characters creation in a 2013 interview: "Jim wanted a cat, and he said, “Give that to her, let her practice.” That was his way of making it easy for me to get really used to the monitor and following things and it was a little training exercise. It was very effective."
Gaffer was occasionally embroiled in the on-stage antics as well, notably providing a distraction during Foo-Foo's dog act in episode 520 and playing the title role in "The Cat Came Back" sketch from episode 523. The feline was also one of the denizens of the Happiness Hotel in The Great Muppet Caper.
Gaffer also made a tiny appearance in the Muppets Take Manhattan as a wedding guest in the Manhattan Melodies wedding scene.
In 1985, an illustration of a baby version of Gaffer was included as a vinyl Colorforms piece in the Muppet Babies Colorforms 3-D Play Set.
- The Muppet Show
- The Great Muppet Caper
- The Muppets Take Manhattan
- The Muppet Revue
- The Muppets Go Camping (1981)
- Bo Saves the Show (1982)
- The Muppets Look at TV (1982 calendar)
- The Phantom of the Muppet Theater (1991)
- Muppet King Arthur (2010)