E-100 Series

E-102 Gamma, the prototypical E-100 series unit.

The E-100 Series are a subset of the wider E-Series of Eggman's robots. Usually being unique machines rather than mass-produced designs, the E-100 series were more humanoid, more armed, more intelligent, and in general more dangerous than their badnik predecessors. Of the (maximum) 24 E-100 series models produced by Doctor Ivo "Eggman" Robotnik, seven have been seen in the games and two have rebelled against their creator.

Introduction

Units E-101 to E-105 were introduced in Sonic Adventure. These five form the 'core' of the E-100 series, sharing the same design but with different colouration. They resemble streamlined versions of the Eggrobo badniks from Sonic & Knuckles, although the weapon functionality is now built into their metallic limbs. They are still powered by a captive animal (specificly, Flickies) like their 2D predecessors. The E-100 series robots have a Greek letter to append their model number; for example, E-101 is Beta and E-104 is Epsilon.

E-101 Beta to E-105 Zeta are tasked with various missions by Eggman throughout Sonic Adventure. Over the course of the game, E-102 Gamma obtains free will and reneges against his master's programming, hunting down his brothers to "set them free" through the dubious liberty of bullet-ridden fratricide. Gamma completes his task but is destroyed in the process, apparently without Eggman ever finding out about his betrayal.

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  E-101 Beta

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  E-102 Gamma

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  E-103 Delta

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  E-104 Epsilon

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  E-105 Zeta

Later models

Sonic Adventure 2 saw scarcely a mention of the E-100 series, but in Sonic Heroes we are introduced to their final member - E-123 Omega. By this point the line has been decommissioned and Omega left to rot in storage; a state of affairs which has engendered in him some bitterness by the time Rouge inadvertantly reactivates the robot. E-123 is determined to destroy his creator's other machines and eventually the fat man himself, in a decidedly wrathful approach to his parental abandonment issues. With Rouge and Shadow he forms part of Team Dark. Omega's power source is unknown; he may or may not have an animal inside, like the Sonic Adventure versions.

In Sonic Battle, Eggman introduces the heroes to the E-121 Phi line. These robots are not unique, nor is their design even Eggman's own; the scientist based these robots on ancient Gizoid technology. The E-121 units prove a persistent nuisance throughout the game, as their move-copying abilities make them adaptable opponents. These robots were powered by Chaos Emerald shards.

Although the line has been decommissioned since before Sonic Heroes, the E-100's humanoid design paved the way for the legions of android models that would follow.

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  E-121 Phi

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  E-123 Omega

Trivia

• Regrettably, the Phi name in Sonic Battle proves that Eggman doesn't know his Greek alphabet too well. Following the convention from E-101 being Beta, E-121 should be Chi, not Phi.
• The robot ZERO is often referred to by fans as E-100 "Alpha". However, there is no indication in the game that Zero is part of the E-100 Series, and indeed Eggman's remarks at the start of Gamma's story indicate that Beta was in fact the first of the set.