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    A spaceship goes on a rescue mission to help a crew on Mars. Only one survivor is found, Col. Edward Carruthers, who is suspected in murdering the crew. However it turns out an alien has come aboard as the ship returns to Earth. The crew must destroy the alien before lands back on Earth.

    Directed by Edward L. Cahn.

    The film was one of the huge inspirations for the 1979 film, Alien.