The Maverick Wars (イレギュラー戦争 Iregyurā Sensou?) are a series of global conflicts between the forces of Mavericks, led by Sigma, and the Maverick Hunters and their allies, led by X and Zero. The war begin as the The Day of Σ occurred. The subsequent rise of Mavericks as global enemies, as well as the formation of Maverick Hunters were the primary catalysts of the conflicts. Only reploids were used in the wars, hence the name.