Machine Man (Aaron Stack, serial number Z2P45-9-X-51 or X-51 for short) is a fictional character, an android superhero in the Marvel Comics Universe. The character was created by Jack Kirby forin 2001: A Space Odyssey #8 (July 1977), a comic written and drawn by Kirby featuring concepts based on the eponymous Stanley Kubrick film and Arthur C. Clarke novel.

Shortly thereafter, Machine Man spun off into his own Kirby-created series. Machine Man originally appeared in the pages of 2001: A Space Odyssey #8 (July 1977), which was written and drawn by Jack Kirby. He would go on to appear in his own self-titled series in 1978.

This title featured Machine Man entering the mainstream Marvel Universe. Jack Kirby wrote and drew the first nine issues, which dealt with the title character's status as a fugitive from the military after the death of his creator, and his first interactions with mankind. The book was cancelled at the end of 1978 with X-51 finally standing up to the military.

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