In this thrill-a-minute action adventure, Sean Barker (Jack Armstrong) is a college student who discovers the "Guyver", an alien mechanical device that merges with his own body, turning him into a super-powerful cyborg fighting machine. The device belongs to Chronos, an evil corporation run by human mutants that metamorphize into monstrous soldiers called "Zoanoids". Chronos badly wants the Guyver back and sends a gang of Zoanoids to kidnap Sean's girlfriend, Mizuki (Vivian Wu). Sean rescues Mizuki with the help of Max Reed (Mark Hamill), a CIA agent determined to keep the device from falling into the hands of Chronos. However, the rescue attempt is not completely successful, thereby triggering a series of epic battles between the forces of good and evil.