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Ikepedia is the officially decreed successor to Gammapedia concerning Gammasphere canon.
Infinitypedia is another successor.
Omegasphere
From Gammapedia
The Omegasphere is a mysterious alternate dimension from which Omegaman came. Very little is known about it, because the only person in the Gammasphere who has ever been there is Omegaman, and even he does not know how to return. He also doesn't talk about it much.
