The Crisis
Storyline: A group of spacemen land on a planet. One of the men encounters an alien lifeform that splits apart and makes countless duplicates of him. When he rushes back to the ship, the copies follow him all demanding to be let into the ship. The captain contemplates leaving the crewman behind as to not let in a alien copy by mistake, but figures out who the real one is among the copies due to his perspiring.
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