Aku in “Unfinished Business”

Aku

(Season(s) 1-4 opening narration) Long ago in a distant land, I, Aku, the shapeshifting 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!