E-101 Beta (Ｅ－１０１ "ベータ" E - 101 "Bēta"?), or E-101 “β”, is a character that appears in Sonic Adventure and Sonic Adventure DX: Director's Cut. 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.