Cyborg IV
Cyborg IV is a science fiction/secret agent novel by Martin Caidin that was first published in 1975. It was the fourth and final book in a series of novels Caidin began in 1972 with Cyborg, profiling the adventures of astronaut Steve Austin, who becomes a spy for the American government after an accident that requires the replacement of numerous body parts with high-powered machines.
Cyborg IV was published after Caidin's original novel was adapted into a television series entitled The Six [Million Dollar Man]. Confusingly, its first paperback publication by Warner Books was issued as Volume 6 in Warners' Six Million Dollar Man book series, even though Caidin's Cyborg continuity is separate from that of the other Six Million Dollar Man-branded novels by authors such as Mike Jahn and Jay Barbree which were novelizations based upon teleplays.