In ancient Japan, a samurai warrior embarks on a mission to defeat the evil wizard Aku. Before completing his task, he is jettisoned thousands of years into the future. Suddenly, he discovers he is in a world where Aku now enjoys complete power over every living thing. Taking on the name Jack, he sets out on a quest to free the future from Aku's grasp and to find a way back to his own time so he can destroy the evil for good.