An actor
Robby the Robot is a 6-foot, 11-inch tall mechanical suit designed for an actor to wear, to play the part of a robot. It was originally designed for the 1956 MGM movie Forbidden Planet,[1] and quickly became an icon. As Forbidden Planet … see full wiki
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Good tip. Robbie also appeared for one episode of Lost in Space. In fact, people for some reason confuse Robbie with the B5 model on Lost in Space, even though they look nothing alike!