The Robot: The Robot is a Model B-9, Class M-3 General Utility Non-Theorizing Environmental Control Robot, which had no given name (Jonathan Harris once jokingly suggested the robot be named "Clawed"). Although a machine endowed with superhuman strength and futuristic weaponry, he often displayed human characteristics such as laughter (usually at Smith, thus provoking the latter's rage), sadness, and mockery. The Robot was designed by Robert Kinoshita (whose other cybernetic claim to fame is as the designer of Forbidden Planet's Robby the Robot) and was performed by Bob May in a prop costume built by Bob Stewart. The voice was dubbed by Dick Tufeld, who was also the series' narrator.