The Penalty is Pinball (S01E11)

Goku and the gang find themselves knocked out by sleeping gas, and when they wake up, the Four-Star Ball is missing! Pilaf has successfully gathered all seven Dragon Balls and is ready to summon Shen Long. To thwart his plan, Goku unleashes a Kamehameha, blasting a hole in the wall of their confinement. As Pu’er and Oolong shapeshift into bats and fly through the opening to reclaim the Dragon Balls, Shen Long is summoned at last. Can they prevent Pilaf from taking over the world?