| abstract
| - Don, John, Will and Dr. Smith are out blasting for ore in order to refine deutronium. Smith is too tired to walk all the way to a designated blasting site and tosses explosives into a nearby bog instead. As a result of the explosion an invisible force, disturbed by the explosion emerges from the bog that night. Dr. Smith constructs a Ouija board so that he can converse with the ghost of his Uncle Thaddeus on the anniversary of his death. When he and Penny attempt to it nearby plants rattle, a glass breaks, and the Ouija board goes flying up into the air. The Robinsons think Smith was trying to play a trick, but the doctor insists it was his Uncle Thaddeus, returned from beyond. Later that night, the Robot warns of an unknown force outside the spaceship. The force acts in a very destructive manner, throwing tables and chairs around and damaging the hydroponic garden. When daylight comes, the force immediately vanishes. Don and John go out to investigate and find a set of enormous alien footprints. Dr. Smith remains steadfast that they are being haunted by the spirit of his uncle who is angry that the Robinsons have slighted him with their disbelief. Don figures out that Smith threw explosives into the bog and believes that by doing so released the invisible force. The next night, Smith attempts to placate his Uncle Thaddeus by holding a seance and getting everyone to sing. The invisible force arrives and beats Don and John soundly before the family retreats into the Jupiter 2. It pounds on the hatch and absorbs the ship’s energy until dawn when it disappears once again. Don and John set up a trap to catch the invisible force, which they manage to do that night. However, when they try to inspect what it is, they find that it is still invisible. They decide to wait until daylight, thinking that they may be able to see it then. Doctor Smith is outraged, thinking they have imprisoned his Uncle, and that the spirits will be angry. He decides to hold a ceremony to appease the spirits and gets Will to come along. Smith and Will go to the bog, where the doctor chants and throws garlic. As this is going on, the invisible force breaks its way out of the cage and returns to the bog. As Will and Smith head back home, Will slips and falls into the bog. The force, now visible, pursues Smith. Smith runs back to the Jupiter 2, where he tells the Robinsons that Will has fallen into the bog. He, Don and John rush to the rescue, but Will has become invisible. The bog monster attempts to attack Will, but he escapes. When dawn comes, Will becomes visible again and the monster disappears back into the swamp. Don and John find Will and are glad to see that he is safe and sound. When Doctor Smith sees Will, he is startled, thinking Will is a ghost who has come to haunt him. Will reassures Smith that he is not a spirit.
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