"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!"
I love Aku, had to draw him.
Samurai Jack/Aku (c) Genndy Tartakovsky