Dragon Ball Kai - episode 5 - 02 May, 2009

Gohan's survival training begins. After a length of time spent alone on a mountaintop, Gohan looks at the full moon, which causes him to transform into a Saiyan "Great Ape." Rather than let him rampage unchecked, Piccolo destroys the moon, making any further transformations impossible for both Gohan and the other Saiyans, and removes Gohan's Saiyan tail, before leaving to begin his own training. Meanwhile, Bulma repairs the scouter, andYajirobe delivers a summons to Krillin, telling him that the two of them, along with Yamcha, Tien, and Chiaotzu, are to report to Kami's Lookout for training. (Source: Wikipedia)