Samurai Jack lives in ancient Japan where his homeland is being ravaged by a mightily and powerful demon named Aku. Jack used his mystical sword to fight him and eventually Jack defeats Aku after a few bouts. But before Jack manages to destroy the demon once and for all, Aku casts a spell that sends Jack into the future, a time when Aku reigns supreme. Now, it is up to Jack to find a way to go back into the past. In order to do so, Jack must wander...

The adventures of Jack, a young samurai and prince whose family has fought the evil demon Aku for control of their kingdom and continues to do so when he mysteriously travels to a future city where Aku and his henchmen-robots rule.