Gaffer was the bedraggled-looking cat who debuted in the fourth season episode guest starring Linda Carter. She became a main character in the show's firth and final season often seen sitting on a ledge backstage and reacting to all the backstage plot scenes. Despite her performer being listed as Kathy Mullen, whenever she meowed, it sounded more like Dave Goelz or Frank Oz to me. Unlike Rizzo and the other rats, Gaffer didn't appear after the movie The Great Muppet Caper, and speaking as a cat lover, I think that's a real shame. I preferred her to Piggy's dog Foo-Foo.