Cyborg is a 1972 science fiction novel by American author Martin Caidin. It introduces Steve Austin, an astronaut and test pilot who is critically injured in a crash and rebuilt with advanced bionic prosthetics, granting him superhuman strength, speed, and vision. The novel blends elements of speculative fiction with the secret agent genre, exploring themes of human enhancement, government secrecy, and the ethical boundaries of technology. Caidin's work was notable for its relatively realistic treatment of bionics, grounding the fantastical elements in scientific plausibility. The novel was the first in a series, followed by sequels such as 'Operation Nuke' (1973) and 'High Crystal' (1974), which further developed Austin's world and missions.