The Battle with Ten-Times Gravity! Goku's Race Against the Clock! (10倍重力と闘え!悟空よ修行はかけっこだ, Jū-bai Jūryoku to Tatakae! Gokū yo Shugyō wa Kakekko da) is the seventh overall episode in the Dragon Ball Z Kai series. The episode first aired on May 17, 2009. Its original American air date was May 27, 2010.
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 prepares 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.
- Originally, Piccolo knocks Gohan off a cliff into a river, picks him up and knocks him back in. In the edited version, he knocks him off a cliff into the river only.
- Originally, Piccolo punches Gohan and also steps on his fingers, making him fall off a cliff. This scene has been removed.
- The scene where Yajirobe bites Krillin is also removed.