this is goku when he was youger. goku is the strongest person alive on earth at this point in time and no one can say other wise and i know you guys are thinking master roshi beat him in the tournament which is true but thats only because he had longer legs if not goku would have won easily. master roshi even says so after the match. goku then travels off to find his grandfathers lost 4 star dragon ball. bulma helps by giving him the dragon radar to help him find it easier and he travels everywere finding the other dragon balls while the red ribbon army is out after him and many other people along the way.