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After the mysterious death of their colleagues, scientists Robert Jones (Robert Culp) and Frank Enari (Eli Wallach) are sent to an isolated research station deep in the Arctic Circle to continue their observation of monkey behavioral patterns. As the two men quarrel over who has to clean the station and other responsibilities, they slowly realize that the deaths of their co-workers may have something to do with a mysterious and dangerous presence, one that the monkeys increasingly fear. Wikipedia