 Both the electrically controlled passenger vehicle driven by Robby and the truck/tractor-crane off-loaded from the starship were also constructed especially for this film.Robby also starred in the science fiction film "The Invisible Boy" (1957) and later appeared in many TV series and films; the C-57D, Robby (and his passenger vehicle) appeared in various episodes of CBS's "The Twilight Zone", usually slightly modified for each appearance.The animated sequences of "Forbidden Planet", especially the attack of the Id Monster, were created by veteran animator Joshua Meador, who was loaned to MGM by Walt Disney Productions.