>>149638868
Brainiac.

Not him being a kryptonian creation, but just showing up one day and wrecking their shit like it was just another tuesday for him. I like how this carries the implication that he's been spreading out over the universe for a LONG time now. Just imagine the characters eventually finding this out and shitting bricks once they realize that he's not just some guy, but a real cosmic-level apocalyptic event.