Maddison (Paul Birch), a rancher and his grown daughter Louise (Lori Nelson) are holed up in their house after a nuclear holocaust has decimated most of the worlds population, their home having been protected from the radioactive fallout by the surrounding mountains, Five survivors including a geologist, a crook and his girlfriend find their house and descend upon the rancher and his daughter. Conflicts of a romantic nature erupt among Louise and her two erstwhile suitors, gun-wielding Tony (Mike Connors) and geologist Rick (Richard Denning) but these are shunted aside when it develops that the valley's infected with mutated radioactive mutant creature.
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