The Robinsons build a small space module, their intention is for it to be boarded by Major West to return to Earth and rescue the rest of the family. The ship is accidentally boarded by Will and Dr. Smith. They ignore that the capsule has not been strong enough to break through the planet's atmosphere and land several miles from the camp and are taken prisoner by a plant creature. The episode is a bit slow and not having a solid script or guest actors ends up being barely acceptable.