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Ikepedia is the officially decreed successor to Gammapedia concerning Gammasphere canon.
Infinitypedia is another successor.
Urbs
From Gammapedia
The Urbs are the gang-ridden scum-infested areas of Gamma City. Until recently, The Urbs were the number one spot for bootleg Flamin Hot Cheetos.
The Nighterror Gang rules the Urbs.