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- This article is on the area; you may be looking for the Sonic Underground alternate dimension.
Sonic and the S6 Squad
Sonic the Hedgehog engaged the Egg Antlion and the members of the Super Special Sonic Search & Smash Squad in the Underground Zone in order to rescue Breezie the Hedgehog, whom he believed to be their hostage. (StH: #268)
- Underground Zone was based on the level, Under Ground Zone, in the video game, Sonic the Hedgehog 2 (8-bit).