ZERO (serial number and codename E-100 "Alpha") was the very first prototype of Dr. Eggman's E-100 series robots. An early and experimental model, the Alpha model had design features that made them unique to most of it's successor "brothers." E-100 Alpha robots were used to track down and capture a green Flicky, as well as Amy Rose, due to her aged body containing powers left over from the Ring of Acorns (which was forged using a Super Emerald and thus could be used to evolve Chaos further).