The Oubliette

Alexander and Dela are somewhat typical siblings, they argue with each other, hate spending time together, and get on each others nerves.
Where they differ from other siblings is that Alexander has super strength and durability, and Dela has inhuman agility and jumping skills. They also co-share a body, which causes some tension.

But all of their problems pale in comparison when they end up trapped in The Oubliette, an inescapable prison in an artificial dimension, that is supposed to only house the worst and most powerful supervillains. If they want to survive, they'll have to learn how to work together very quickly, and figure out why they ended up there.