https://www.imdb.com/title/tt0038007/
A Martian spacecraft crash-lands near an observatory of the designer of
Earth’s first spaceship. The survivor can assume the form of any
earthman. Calling himself the “purple monster”, the invader sets about
gaining control of the scientists rocket project. His plan is steal
the plans, build a ship, return to Mars and using the design, build a
fleet to carry invasion forces to Earth.
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