See where the legend of Samurai Jack began...

"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 the Samurai far into the future where my evil is law. Now he seeks to return to the past and undo the evil that is Aku!"