Dragon Ball Kai - episode 7 - 16 May, 2009

After three weeks, Goku succeeds in catching Bubbles. He is then issued his second challenge, to hit Gregory, the flying grasshopper, with a large mallet. After two weeks of trying, Goku succeeds and fully masters the planet's gravity in the process. King Kai then proceeds to teach Goku his signature technique: the Kaio-ken. On Earth, Gohan's training with Piccolo comes to a close, while the rest of the Z Fighters finish their training with Kami and go their separate ways. (Source: Wikipedia)