E-100 Alpha (codenamed ZERO) is a villain from the Sonic the Hedgehog series. Playing a major role in the video game Sonic Adventure, Zero is a giant green and black robot with red eyes that many people say resembles a trash can with large arms and wheels. Zero made his debut by chasing a blue flicky who had taken refuge with Amy Rose. Zero chased Amy around Station Square and ran into Sonic the Hedgehog. Zero caught up with Amy in Twinkle Park and took her to the Egg Carrier. Amy managed to escape from her prison cell with help from E-102 Gamma and wandered into the Hot Shelter, where Zero found her and started chasing her again. Zero lost Amy again, but then travelled to the Final Egg base in the Mystic Ruins, where he found Amy and the flicky exploring the base. Amy and the flicky escaped Zero and returned to the Egg Carrier, where they found the bird's parents, whom were inside E-101 Beta and E-102 Gamma. Zero then attacked and knocked out the small flicky. Amy got mad and challenged Zero to a fight. Zero was a tough competitor, firing shockwaves and swinging arms that Amy found hard to avoid. She then defeated Zero by slamming him into an electric fence and short-circuited him, and a compartment popped open in Zero's head. Amy with one final cry smashed her hammer into the compartment and blew Zero's head in, destroying him. Curiously, unlike the other E-Series robots, there is no animal inside Zero. Zero makes a cameo appearance in Sonic Advance 2 as an obstacle in the special stages.