Virus


 * The Maverick Virus, a virus that infects Mavericks in Mega Man X
 * later renamed the Sigma Virus after Sigma, the new leader of the Mavericks
 * The Colony Virus from the Eurasia colony
 * The Zero Virus in Mega Man X5, formed by Sigma merging the Maverick and Colony viri
 * Viruses in Mega Man Battle Network