 episode "The Bridge of Lions Affair", only Robby's head dome was used as part of a regeneration machine.Robby also appeared in the "Mork & Mindy" second-season episode "Dr. Morkenstein", this time representing a character called Chuck (voiced by actor Roddy McDowall) whom Mork befriends while working as a security guard in the science museum where Chuck is on display.Robby was given a major 'makeover' for his appearance in the TV series "Project U.F.O."