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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Zeta was created as one of Doctor Eggman's E-100 Series robots. At one point, Eggman got annoyed with Zeta and converted him into a turret, no longer mobile. When E-102 Gamma returned to the Egg Carrier looking for Beta, he found Zeta and reprogrammed him, before finally encountering Beta.