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A nervous Dr. Smith (Jonathan Harris) is left behind with the women when the rest of the men embark on a search of supplies. During their own scouting trip, Smith and the ladies come across a space ship that has been in a state of suspended animation for decades--and which is occupied by a cute little beagle. Upon returning to the camp, they discover that their own ship has been looted. Despite the protests of Judy (Marta Kristen), everyone accuses the dog of being the "burglar"--little realizing that the ladies are being stalked by a sinister space alien (played by familiar broken-nosed character actor Charles Dierkop).