 It was ported to the Amiga, Amstrad CPC, Atari ST, Commodore 64, MS-DOS, SAM Coupé, and ZX Spectrum.According to the introduction, Planet X is a synthetic industrial planetoid whose most notable feature is the research laboratory of the buxom and brainy Dr. Sarah Bellum.Evil aliens called Reptilons invade the planet, capture the good doctor, and force the rest of the humans to manufacture a robot army to take over the Earth.