The story of Mega Man X3 is a retro platform game set during the 22nd century (the year “21XX”), in which humans coexist with intelligent robots called “Reploids” (replicant androids). Due to their free will, some Reploids are prone to criminal activity and are said to go “Maverick”. Dr. Cain, the inventor of the Reploids, establishes a military taskforce called the “Maverick Hunters” to prevent it.