In the alien spaceship they find what appears to be a log. Professor Wedgwood (Peter Williams) and Dr. O’Connell (Harold Goldblatt) manage to decipher the alien hieroglyphics. They also find a video recording done by the aliens. The log tells the story of how the aliens came to the moon because of unrest on their planet. Two factions were at war. The use of nuclear weapons destroyed both civilizations and poisoned the land with radioactivity.
One spaceship reaches the Moon, but it contains, what the leader of the expedition called, the children of our enemies. Despite this the leader decides that he must try to save civilization. The children, along with a pilot, are sent out to try to find another planet to live on. The leader stays behind. It is his body that is preserved and calcified. Conway Henderson (Gerald Flood) believes that the aliens were from Earth and that, after the devastating war, the Earth eventually healed and evolved into homo sapiens.
In the meantime, a meteorite hits MR-1. Ian Murray (Hugh Evans), who stayed behind on MR-1 to maintain the rocket and communications, manages to escape before MR-1 blows up. Professor Wedgwood and Professor Meadows (Pamela Barney) find him and bring him back to the lunar base in the cave.
Professor Wedgewood determines that MR-2 can be stripped down and has enough fuel to return to Earth. The problem is that the payload will only be able to carry one adult and one child.
The special effects are low-brow and the props mostly cardboard, but the plots of episodes are fanciful and charming. At least the producers tried to create effects instead of using stock footage. The space helmets were not exactly functional, but one gives up logic in order to hear the actors talk. Well, at least the guinea pig was real.