The Seven-Star Dragon
After stumbling upon Naturon Shenron as he burrowed through the ground, Goku and Pan have to save an entire city from the earthquakes caused by this dragon's digging. But when the dragon takes a fall a little too soon, all may not be what it seems - and Pan may be in for far more than she bargained for.
Aired 09/07/1997EP 52 - The Seven-Star Dragon
Dragon Ball GT
Emperor Pilaf finally has his hands on the Black Star Dragon Balls after years of searching, which are said to be twice as powerful as Earth's normal ones. Pilaf is about to make his wish for world domination when he is interrupted by Gokuu Son. As a result, Pilaf flubs his wish and accidentally turns Gokuu back into a child.
After the wish is granted, the Black Star Dragon Balls scatter across the galaxy. However, Gokuu discovers that they will cause the Earth to explode unless they are all brought back within a year. Uniting with his granddaughter Pan and a young adult Trunks, Gokuu sets off on an adventure through the universe to find the Black Star Dragon Balls and save his planet from destruction.
(Source: MAL Rewrite)