Timmy was also Crow T. Robot's "special friend" on the Mystery Science Theater 3000 episode Fire Maidens of Outer Space. He is essentially an evil version of Crow painted black. The puppet used for Timmy is the puppet they use for the theater segments, as it shows up better in silhouette.
Upon discovering Timmy's evilness, Joel Hodgson shot Timmy out of the airlock of the Satellite of Love. Timmy showed up in Deep 13, where he promply terrorized Dr. Clayton Forrester and TV's Frank.