The comic version of Hank was a NASA astronaut who was exposed, along with his wife and the rest of their crew, to a solar flare that damaged their ship and everyone inside.
Cyborg Superman was created by Dan Jurgens for the Adventures of Superman #500 comic in 1993.
Cyborg Superman would go on to be a recurring villain for Superman, as well as Green Lantern.
The entire crew began to mutate, and, tragically, everyone except for Hank eventually committed suicide after returning to Earth.