Superboys Wild Ride

After the Sinestro War, Superboy-Prime was believed to have been killed by a Guardian of Oa. However, he somehow survived and found himself in an unknown part of the multiverse. Instead of dying, he coalesced with the energies of the sacrificed Guardian, causing him to rapidly age into adulthood and gain tremendous power. Now calling himself Superman Prime, he has established a base inside the source wall, a barrier that separates different realities. Within this base, he has imprisoned Mr. Mxyzptlk and subjected him to torture in an attempt to learn how to restore his universe. Unfortunately, the answers he pursues are not easily obtained...

I will be using Superboy and Superman interchangeably.