For those of you too young to recall, Lost in Space was a black and white science fiction series that ran for three seasons between 1965 and 1968. The story purportedly began in 1997, when the family Robinson, Dr. Smith and Major West were launched to colonize a planet orbiting Alpha Centauri, the second closest star to our solar system. Because of sabotage by Dr. Smith, the ship went off course, with the result that the group was "lost in space" as it were.
Those of you old enough to have watched Lost in Space or reruns thereof will recall the critical role the Robot played in the show, particularly as a foil to the cowardly Dr. Smith, whose rivalry with the Robot often provided comic relief.
The Robot's famous lines included: "Warning, Warning" and "Danger Will Robinson."
The Robot was formidable at times, capable of detecting approaching storms and other threats and shooting some sort of electrical rays from its claws. The Robot was also quite vulnerable, since removal of a small power pack attached to its exeterior would disable it completely.
Believe it or not, one can purchase life-size replicas of the Robot at the following site, which also includes several photos of the robot from the original series.