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A spaceman -- with a raygun -- for hire takes on a crooked land baron in this drama that moves Western themes into outer space. In the year 2021, Bill Kemp (James Olson), the first man to walk on Mars, is an astronaut for hire, renting his services to the highest bidder. J.J. Hubbard (Warren Mitchell) is a multi-millionaire who pays Kemp to help blast an oncoming asteroid out of its orbit so that it will avoid the Earth and crash into the moon. However, Hubbard's goal is hardly benevolent. The moon is being excavated for mineral resources, and since fragments of the asteroid in question resemble jewels, it will allow Hubbard to fraudulently jack up land prices on the lunar surface. Kemp also learns that Hubbard was responsible for the death of the brother of Clementine Taplin (Catherine Schell), the woman he loves. Kemp realizes that he can no longer do business with Hubbard, and he sets out to foil Hubbard's schemes before it's too late. Moon Zero Two was directed by Roy Thomas Baker, who also made a number of pictures for Hammer Films, including the respected sci-fi cult film Quatermass and the Pit.