Fred lost his leg in a hiking accident.
The carbon-fiber leg replacement was so good, he had the other one amputated and replaced.
Refinements made them even better, and with intelligent and sensing exoskeleton enhancements allowed him to leap and run in ways he could never imagine.
He underwent more procedures, replacing his limbs and organs to make him a mechanized superman, capable of doing amazing things.
Still, every so often, he’d hesitate. Caution held over from his weaker, biological days.
One robotic hand raised up on its own, yanked off his screaming head, and tossed it into the trash.