100 years after the end of DBGT, all the heroes of Earth have died...except for Pan, the granddaughter of Son Goku. Pan has a grandchild named Goku Jr. However, he does not have the bravery of his great-great-grandfather. Pan suffers a heart attack, and Goku Jr. believes that he might be able to save her with the power of the 4 star Dragon Ball. Along with the school bully, he tries to find the ball...and unleashes his hidden bravery and power.
Years after the end of the Dragon Ball GT, the story continues in this special with Son Goku's now elderly granddaughter Pan, and a new generation of Super Saiyans, the great-great-grandsons of Goku and Vegeta.
Goku and Trunks are on the verge of defeat, finding themselves in the sinister grip of a mad scientist who wishes to use their Saiyan bodies in his twisted experiments! But what's this? Goku is a child?! The grandest adventure of all begins now!