E-103 Delta (Ｅ－１０３ "デルタ" E-103 Delta?), or E103δ, is the fourth of the E-100 Series robots constructed by Dr. Eggman, coming behind E-100 Alpha, E-101 Beta, and finally E-102 Gamma. He appeared in Sonic Adventure, in which he plays a minor role in E-102 Gamma's story as a boss. He resembles the other E-Series robots, except that he is silver and blue in color. He has the dual rocket launchers like Beta, but in addition it has a jetpack built into itself for short range flight.