Zak, Cloe, Kiet and Fenzy are four unpopular kids from Earth with no talent for sport. One day they find wristbands that have the power to transport them to another dimension. There they meet Tänpo, a Sendokai master, who tells them that the evil Zorn empire is conquering every dimension of the Multiverse. The Earth is in danger and there is only one way to save it: they will have to overcome their weaknesses, learn the art of Sendokai to become warriors and win the Grand Tournament of the Multiverse.