Zak, Cloe, Kiet and Fenzy are four unpopular kids from Earth who are not very good at sports. One day they find bracelets that have the power to transport them to another dimension. There they meet Tänpo, the master, who explains that the Zorn Empire is about to conquer the Multiverse. The Earth is in danger and, if they want to save it, there is only one way: they will have to overcome their weaknesses, learn the art of Sendokai to become warriors, and win the Great Sendokai Tournament of the Multiverse.