In episode #3.6 of "Mystery Science Theater 3000" (1988) (Time of the Apes) his character had to take care of a baby turned into a grown-up body by an experiment. In episode #1.3 of "Sabrina, the Teenage Witch" (1996), he played a baby turned into a grown-up body by magic.During his five year run on "Mystery Science Theater 3000" (1988), he was the one responsible for picking the movies that were shown.Replaced J. Elvis Weinstein (then known as Josh Weinstein) as Dr. Forrester's assistant henchman on "Mystery Science Theater 3000" (1988). When Joel Robinson ( Joel Hodgson ) asked him where Weinstein's character, Dr. Laurence Erhardt or Dr. Larry, was, he simply held up a milk carton with Larry's picture on it and said "He's missing.".
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When zany mad scientist Dr. Clayton Forrester and his loopy assistant Frank get bored with their work at the Deep Thirteen research center, they kidnap Joel the janitor and shoot him into orbit on the Satellite of Love. While in space Joel builds wacky robot sidekicks Tom Servo and Crow T. Robot to help him withstand an onslaught of grade 'Z' movies that the mad scientists force him to watch.