E-101 Beta (Ｅ－１０１＂ベータ＂ Ī Ichi-Zero-Ichi "Bēta"), or E101β, is a character that appears in the Sonic the Hedgehog series. He was the first animal-powered E-100 Series robot created by Dr. Eggman. Initially intended to serve onboard the Egg Carrier, Beta lost the position to his "younger brother" E-102 Gamma. As such, he was discarded by Eggman and upgraded into E-101 Mark II.