It's your mission to help the exiled scientist Ciel discover the source of a new reploid energy! Play as Mega Man's pal Zero, the reploid from the Mega Man X series turned good by the infectious Sigma Virus and 100 years of sleep. Players control Zero through the missions and must confront several adversaries along the way. Collect more than 70 Cyber-Elf power-ups to help you get through tough spots. Conquer your enemies and find the energy source... or risk ultimate defeat. It's up to you to defend good from the destructive powers in the universe.