7. Metallo
Depending on the version of the comics drawn from, John Corben either voluntarily or involuntarily submits his dying carcass to science, whose brain is then transferred into a warm body with a metal-alloy skeleton, powered by a green Kryptonite heart. The endoskeleton of metal gives the former John Corben not just enhanced strength, stamina and speed, but also provides some potentially great cinematic visuals for a MoS sequel, for once damage begins to inflict John Corben's human exterior, his ripped flesh tears away exposing the metallic cybernetics inside, giving Supes a villain of imposing threat physically, with oodles of potentially frightening visuals and what could be violently unsettling action, as John Corben melts away to expose Metallo underneath, a Kryptonite-powered Terminator! Hasta la vista, MoS sequel, I'm there!