One night during training, Gohan gazes at the full moon and transforms into a Great Ape. Before he causes any serious damage, Piccolo destroys the moon, which turns Gohan back to normal, removes his tail, preventing him from transforming again, and then leaves him to fend for himself. A message from Yajirobe tells Krillin to go train at Kami's Lookout, and to bring Yamcha, Tien, and Chiaotzu along with him.