Robby appeared with Rod Serling (top) and Richard Deacon (bottom) in two episodes of The Twilight Zone, where he was played by effectsman Dion Hansen. The show, produced by MGM, featured other props from Forbidden Planet, including the 20” saucer model (middle) which was painted over for reuse.

Frederick S. Clarke and Steve Rubin. “Making Forbidden Planet.” Cinefantastique, vol. 8, no.s 2-3 (Spring 1979): pp. 4-67. [caption and photo on page 66].