Nebulon & John Crimson

Beneath the grand throne room lay a massive underground medieval dungeon, a top-secret place known only to King Nebulon and his alien soldiers—completely hidden from the superhumans. While it might be an alien spaceship, King Nebulon was born in a world of sword and magic, so he tended to prefer a medieval or fantasy-style architecture.

This underground dungeon was where Nebulon secretly absorbed his livestock. Naturally, afterward, he would consume their bodies, as he was a cannibal. Unfortunately, Nebulon wasn't a saint. Even back in his own world, he had been a wicked criminal, taking pleasure in harming others and even studying black magic.

Of course, he did all of this in secret to avoid causing panic among the superhumans. If any of them discovered his sinister plan, many would rather commit suicide than allow themselves to be absorbed by Nebulon.