To make matters worse, a mysterious mercenary named Dynamo has scattered another virus in remote space colony Eurasia and sends it on a collision course towards Earth.

A revived Sigma spreads a virus around the world that turns Reploids into berserk Mavericks. Set in 21XX, the game takes place several months after the events of Mega Man X4 (where Maverick Hunters Mega Man X and Zero ended Maverick Sigma's plan to manipulate an anti-Maverick Reploid military force to destroy all human life on Earth). Both protagonists Mega Man X and Zero have new and improved abilities (such as multiple armors for X) and can now be switched out between levels (rather than separate them into different campaigns). The fifth main installment of the Mega Man X series (and the sequel to Mega Man X4), Mega Man X5 features a new mission structure where all of the eight main stages are optional (and only contribute towards X and Zero's abilities and how the story progresses). Mega Man X5 (known in Japan as Rockman X5) is a side-scrolling action platformer developed and published by Capcom for the PlayStation on January 31, 2001.

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