Ten years since the two first met, Goku and Uub continue to train together, with Goku still in contact with his family and friends. Goku is busy teaching Uub how to use the Kaioken when they are interrupted by a machine created by the Vargas. They are invited to join the tournament the Vargas are hosting, and Goku is the first person to jump at the chance to fight in another tournament, insisting that it would be a perfect way to test how much Uub has improved without risking damage to the Earth.