Plague of Demons

A tough human is biologically engineered into an indomitable fighting machine so that he can deal with a threat to Earth, and finds – after a long, remarkably sustained chase sequence ending in his capture by some singularly efficient Aliens – that for centuries Earth has been being despoiled of its best fighting men, who, like himself, have been taken off-planet and surgically transformed into command centres for gigantic, armed fighting machines embroiled in an aeons-long interstellar war. In this Cyborg form, he regains autonomy, organizes a revolt of his fellow cyborg-supertanks and prepares to carry – fabulously armed – his message of freedom to the stars.