The E-Series ( Ｅ－シリーズ , E - shirīzu ? ) are a robot line that appears in the Sonic the Hedgehog series . They are a production line of robots created by Dr. Eggman , who uses them in his quest to conquer the world. They are considered to be elite versions of the Badnik robots Eggman used in earlier games. The name was first used in Sonic Adventure .
The E-100 Series are robots who were created by Dr. Eggman to serve as his enforcers. While many of them, like E-106 Eta , have been fully dedicated to serving their creator, others, such as E-123 Omega , have rebelled and joined his enemies.