The Source of Rilldo's Power
Goku and Rilldo continue to fight, but Rilldo reveals his secret power: he can manipulate all of the metal on the planet, allowing him to appear anywhere there is metal, among other things. Pan, meanwhile, is trying to sneak into the main tower, but the emergency removal system keeps spitting her back out. But with the help of another robot, she deactivates the system. Before she can destroy Giru, he reactivates it, spitting her back out. Luckily, the Dragon Balls got spit out with her. General Rilldo tells Goku to give up, because as long as there is metal on the planet's surface, he can't be destroyed.
Aired 31/07/1996EP 20 - The Source of Rilldo's Power
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)