Moontrap

During a routine flight, two veteran space shuttle pilots discover an alien artifact and bring it back to earth. It soon turns out to be an extraterristial war robot, which is able to recycle any biological or technical material for its own deadly use. The two astronauts are sent to the moon where Nasa expects to uncover the mystery of the alien robot's origin. They discover an ancient humanoid culture and battle the ultimate threat of the war machines heading earth.