As Dr. Smith, the children, Debbie and the Robot look for ore, they happen across a maser teleportation machine left behind by the Taurons in "The Sky is Falling." Later, Penny and Debbie are caught in the beam when it activates, but no one is there to witness the event or do anything about it. Shortly afterwards, John discovers that Dr. Smith has the last of the supply the carbon tetrachloride which the family needs for food preservation. Smith, the Robot and Will go to look for Penny. They cannot find her, but Smith orders the Robot to work the maser teleporter, and Penny and Debbie and reappear.