During the period when Dr. Eggman's Operation: Clean Sweep altered reality and reshaped Mobius, the Marble Zone was a region consisting mostly of trees, ruins, and magma deposits. After Sonic freed Sally, Antoine, and Boomer from a capsule in Green Hill Zone, Sally lead the others to Marble Zone as part of a shortcut to Dr. Eggman's lair. Here they encountered the Badniks Caterkiller, Bat Brain, and Buzzbomber before Dr. Eggman made an appearance to get revenge for Sonic beating his nephew Snively in Green Hill Zone. With the help of a reprogrammed Buzzbomber, Sonic managed to defeat Dr. Eggman, and Sally continued to lead the gang. (StH: #226)
- This zone is not to be confused with Marble Garden Zone, which was frequently called "Marble Zone" in the comics.