In the oppressed world of Vengeful Guardian: Moonrider, humanity finds an unlikely hero. After building an army of super soldiers as weapons of war, the authoritarians unwittingly seal their own fates by bringing online the ninja warrior known as Moonrider. Conceived as a tool to preserve the totalitarian state, the Moonrider instead rejects its intended purpose and wages a relentless battle for vengeance against its creators and fellow super soldiers.