Will, Dr Smith and the robot follow a golden ball that rolls into a cave. Inside they meet a group of aliens known as Saticons. The Saticons announce they want the robot. Don and John also go to the cave. The Saticons offer great riches in exchange for the robot. Their offer is refused.
That night while the Robinsons are sleeping, the Saticons enter the Jupiter 2. They persuade the robot to come with them. They take the robot back to their cave and dismantle him. Later, Don and John come looking for the robot. The Saticons say they are finished examining the head and they may take that part only if they wish.
The next day the Saticons return the rest of the robot in many pieces. Don and John go about the task of putting him back together. At the same time strange occurrences begin happening to all the Robinson’s electronic gadgetry.
A drill John is using seemingly develops a mind of its own and won’t switch off. The food storage units cease working and Dr Smith rides an exercise bike (really!) that refuses to shut off. Penny claims to receive a mild electric shock every time she switches on a light in her room and Don suddenly has trouble operating the chariot’s ignition switch. The Jupiter 2 then loses all power and climate control systems.
Once reconstructed, the robot reveals the Saticons plan to rule Earth by controlling all machines. Don and John go to the Saticons cave and attempt to destroy their device that can control and corrupt all machines but their lasers refuse to fire. In the end, in an act of high-stakes irony, it is left to another machine, the robot, to fell the Saticons malevolent thingamabob.
Nathan Juran (1907 – 2002) was the director of WRECK OF THE ROBOT. He helmed a total of 13 (out of 83) episodes of LOST IN SPACE. Before entering the film industry he worked as a professional architect. He also directed 29 episodes of the tv series DANIEL BOONE and 5 episodes of the series MY FRIEND FLICKA among a host of other film and television credits.