E-101mkII

E-101βmkII, known to many fans as Beta Kai, is an upgraded version of E-101 Beta, an Eggman robot from the E-100 Series. The principal foil of E-102 "γ"'s story in Sonic Adventure, Beta is fought as Gamma's first boss in his normal form, and again as this floating, laser-blasting killing machine.

After Beta is defeated by his "younger brother" Gamma following Final Egg, Dr. Robotnik looks set to cast the black robot aside and refuse him a place on the Egg Carrier. Mutely pleading with his creator, Beta eventually extracts the grudging concession that "Okay, okay. We could always use a spare set of parts, I guess". Eggman's words prove unpleasantly prophetic for E-101.

The robot is rediscovered only when Gamma enters the wrong room after being assigned to extract Birdie from Amy's cell. E-102 stumbles in on his older sibling being physically dismembered in an Egg Carrier robotics lab, his legs a sparking pile of scrap on the floor as mechanical arms remake him into into E-101βmkII. This witnessing of Robotnik's callous cruelty even towards his own creations is the breaking point that sets Gamma on the road to apostasy; first freeing Amy Rose, then sparing Sonic's life, and eventually deleting Eggman from his registry as lord and master. Gamma's quest now turns to the fratricidal, and after hunting down Delta and Epsilon, he returns to the Egg Carrier for Zeta and finally Beta.

The remade E-101 fights Gamma on the Carrier's central arena; the same spot in which others fight ZERO and Chaos 6.

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