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|This character exists primarily or exclusively within the Pre-Super Genesis Wave continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Tracked to Old Megaopolis, Northamer. Continued pursuit despite multiple liberation confirmations. Post-battle scan shows Zero Viruses. STATUS: Liberated.
— E-102 Gamma's Data Log, From the Databanks of E-102 Gamma
E-117 Sigma is a character who appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was the eighteenth unit in the E-100 Series line, created by Dr. Ivo "Eggman" Robotnik.
E-117 Sigma was created sometime between 3236 and 3237, possibly during or after Dr. Eggman's campaign on harnessing the power of Chaos. Apparently, Sigma was infected with the Zero Virus, to which it was shut offline at Old Megaopolis at Northamer because of the disease.
- The description of E-117 Sigma being infected by the Zero Virus is a direct reference to the Mega Man X character Sigma, who was affected by the Zero Virus, a sub virus of the Maverick Virus in the Mega Man X universe.