 The Season 5 episode "Uncle Simon" (1963) featured Robby, although his appearance was considerably different, combining the familiar body with an alternative head.According to Robby's current owner, director William Malone, the head used in this episode was a prototype created during Robby's original construction.It featured a highly simplified and rather old-fashioned cylindrical "oil can" robot head with stylised 'eyes' (that were illuminated and movable) and a circular 'mouth'; this was enclosed under the distinctively-shaped conical plexiglass dome, but this head's front grille also did not have the blue neon tubes and lacked the rotating external 'ear' pieces seen in "Forbidden Planet".