The Scrap Brain Zone was one of Dr. Eggman's bases of operation, situated on South Island. It had the layout of an industrial city, and Dr. Eggman equipped it with many types of booby-traps (flamethrowers, lasers, trapdoors, etc). The base seems to be situated above ruins resembling that are either a part of, or least greatly resemble, the Labyrinth Zone.
Sonic the Hedgehog visited this area after passing through Star Light Zone on his very first adventure to stop Dr. Eggman and his assistant, Dr. Julian Snively, when the two mad doctors came to South Island to strip-mine and process the island as part of their plan for world domination. From here, he chased them down to Final Zone. (StH: #288, VG: StH1, SSD: #12)
- The Scrap Brain Zone appeared in the first Sonic the Hedgehog game and was the second to last zone of the game.