Long ago in a distant land, I, Aku, the shape-shifting master of darkness, unleashed an unspeakable evil.

But a foolish samurai warrior wielding a magic sword stepped forth to oppose me.
Before the final blow was struck, I tore open a portal in time, and flung him into the future where my evil is law.

Now the fool seeks to return to the past and undo the future that is Aku .