Omicron was the fifteenth E-Series robot created by Dr. Eggman. At some point it was stationed in a mountainous region of Yurashia, where it ambushed E-102 Gamma. Omicron began an aerial bombardment and forced Gamma to retreat, attacking for 163.5 hours before its ammunition was depleted, whereupon Gamma successfully destroyed it and freed its Mobini battery. (ASUB)