Playable champions can come from six different universe and champion names incorporate their origin universe..
Prime (Earth-0)
This universe is where hundreds of heroes and villains originate. Universe Prime, also known as Earth-0, is the keystone upon which the Multiverse rests, and so the Monitor has great interest in maximizing the fighting potential of its populace to better defend it from extra-dimensional threats.
Arcane (Earth-13)
The Shadow League, a cabal of twisted sorcerers, lusted for absolute rule over Earth. Blinded by ambition, they performed a ritual that extinguished the Sun. With eternal night blanketing the Earth, the world's most powerful magicians united to reignite the Sun, but its new arcane heart forever altered life on Earth. Heroes and villains have since adapted to their magically infused environment, developing strange new abilities.
Atomic (Earth-17)
As the Cold War was brewing between the world’s superpowers, a mysterious object from space crashed into Kansas. Mistaking the crash for a first strike, the United States unleashed its full nuclear arsenal against the Soviet Union, who retaliated. The ensuing nuclear war instantly vaporized 97% of all life on Earth. The survivors hope the Earth can be healed, but the nuclear aftermath has left them with scars that never will.
Gaslight (Earth-19)
The Victorian era has swept the Earth and a prosperous Age of Invention has revolutionized society through powerful steam technology, and this amazing progress is only the beginning. Heroes and villains have begun to emerge from all corners of society, and with them bring new sources of power and problems far stranger than steam and gas lights.
Nightmare (Earth-43)
Tales of horrors prowling the night were once just legends on this Earth - until the darkness returned. Ancient and terrible powers beyond comprehension awoke and brought with them an army of monsters. In fighting these creatures, some heroes have fallen, twisting into monsters themselves like Nightmare Batman. Heroes and villains have set aside old rivalries and are united in fighting darkness that threatens to engulf their world forever.
Mecha (Earth-44)
In this universe, there were no heroes, until a league of scientists known as the Justice Consortium created them. Technology had always been advanced on this Earth, but these new robotic creations were able to think and feel, and wielded powers beyond anything yet seen. They now defend the Earth from threats within and beyond, particularly the Doom Legion and their villainous assassin bots.
