The Five-Star Dragon

Goku, Pan, and Giru land in a nearby city to get something to drink, and they discover that all its inhabitants have left. They find some weird electric slime, and they figure out that the five-star dragon is controlling the slime. He gathers the slime and becomes gigantic. Goku transforms into a Super Saiyan 4 and tries to blast the dragon, but the slime bounces his attack back at him. The dragon traps Goku and Pan in the slime, which begins to electrocute them. Suddenly, it begins to rain, causing the dragon to short circuit and explode. Goku and Pan claim the five-star ball.