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The planet is invaded by the mechanical denizens of INDUSTRO, who turn out to be tiny duplicates of the Robinsons' robot. Appointing the Robot as their leader in a mission to take over the universe, the diminutive invaders are dismayed to discover that the Robot is too kind and gentle for such an undertaking. Thus, they exchange the Robot's personality with that of the treacherous Dr. Smith (Jonathan Harris)--and vice versa. This is the episode that opens with Smith being given the "Gulliver" treatment by the mini-robots (who are actually a group of Lost in Space tie-in toys created by Remco!)