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Knuckles the Echidna traveled to Sky Sanctuary Zone after Dr. Eggman's treachery was made known to him in order to recover the Master Emerald, and was forced to battle a robot that combined qualities from Metal Sonic and Silver Sonic. It would later be one of several locations visited by past and present versions of Sonic due to the actions of the Time Eater. (VG: S&K, SG)
- Sky Sanctuary Zone is based off the level of the same name in the video game Sonic & Knuckles.