abstract
| - A perennially bored Dr. Smith decides to separate the Robot's torso from his tread section. The tread section goes out of control and accidentally enters the Space Pod, which then gets launched into space. The Pod lands on a planet that the Jupiter 2 is passing by. Professor Robinson contacts aliens on the surface by radio, and they OK a landing. After landing, the Robinsons realize that they have been tricked by the aliens. They resign themselves to having to leave without The Robot or the Space Pod. Then the entire Robinson party except for Will and Dr. Smith are kidnapped by the aliens and put into suspended animation. The aliens plan to send duplicates of the Robinsons back to Earth on the Jupiter 2 with the intention of eventually conquering the Earth. The aliens have by now captured the upper section of The Robot as well, and have taken over control of him. Dr. Smith and Will replace their duplicates with the real thing in the alien invasion team and the aliens leave for Earth. The duplicate Dr. Smith is aboard the Jupiter 2, but he has been tied up by the real Dr. Smith. Eventually the alien Dr. Smith escapes and exposes the real Dr. Smith and the effort to thwart the alien's plan. While the Jupiter 2 has been travelling toward Earth Will gets the Robot over to his side. The Robot knocks out the duplicate Professor Robinson and Major West, and Will takes over control of the Jupiter 2. After the Jupiter 2 lands on Earth, near downtown Chicago, Illinois, Will pilots the ship back to the alien planet to rescue his family and Major West.
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