- For the version of this location before the Super Genesis Wave, see Prison Island (Pre-Super Genesis Wave).
Prison Island is a location mentioned in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. it is a large jungle island used as a prison and research base by G.U.N. The island held an number of facilities and bases, where Shadow the Hedgehog was kept in stasis for over fifty years.
Sonic Adventure 2
Dr. Eggman first came to Prison Island to find G.U.N.'s secret weapon, which turned out to be Shadow the Hedgehog. Some time later, Sonic the Hedgehog was captured by G.U.N. due to a misunderstanding and imprisoned on the island, but was rescued by Tails and Amy. At the same time, Shadow, Eggman, and Rouge the Bat attacked the island to take G.U.N.'s Chaos Emeralds. They succeeded and planted several explosives on the island, blowing it up as everyone escaped.
Shadow the Hedgehog
The explosives had only destroyed G.U.N.'s main base and spilled toxic waste into the rivers. While G.U.N. maintained a presence on the island, the Black Arms would infiltrate Prison Island during their invasion of Sonic's World and infest it with Conduit Gel. Shadow and Charmy would also appear on the island during the invasion for different missions.