Kip. 6: The End of Snake Way! King Kai's Bizarre Test!

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Six months have passed since Gohan's incident with the full moon, and he has since become much more adept at surviving in the wilderness. Piccolo then begins training the boy personally in martial arts. Meanwhile, Goku has arrived at the end of Snake Way, meeting King Kai on his planet, which, despite its small size, has ten-times Earth's gravity. In order for Goku to train under King Kai's teachings, he must attempt to make the master laugh. After Goku's accomplishment of making him laugh, King Kai tells Goku to catch his pet monkey, Bubbles. This proves to be a difficult task for Goku due to the planet's intense gravity, but he is persistent and refuses to give up. (Source: Wikipedia)