Robots were extremely popular in the science fiction of this era, including the killer robot meme (now sadly hackneyed). The robot here certainly drew inspiration from the design of Gort, a robot character that appeared in 1951's The Day The Earth Stood Still. That film, ironically, turned the killer robot concept sort-of inside out; this episode is much more straightforward. It is weakened by the lack of a concrete explanation for the robot's bad behavior. Certainly bad things happen for reasons that are poorly understood or never understood - but the episode declined to explore that in much depth, as well.