From the top of Megacity S1-9, the Sovereign Khan rules with fists of iron and flesh. Beneath the city's rotting foundations, a vengeful warrior embarks on a journey to murder him. 5 years prior to the events of Slave Zero, Slave Zero X brings new life to a world where horrific, living machines known as Slaves are primed to become the latest tools of war in humanity's long and bloody history. A secret band of warriors known as The Guardians hope to stop these biomecha from being unleashed upo...