Other source:
After a rough day of training, Gohan rests for the next day. Gohan has a bad dream involving Raditz beating his father, and he suddenly wakes up. He finds that his tail has grown back. Gohan looks up at the moon, which has mysteriously reappeared, and begins to transform. Piccolo does his best to stop him, but once Gohan transformed into the Oozaru, he was powerless to stop him. Piccolo tries to destroy it, but finds that it is a projection from Goku's old spaceship. Piccolo destroys the ship, reversing the transformation. Meanwhile, after a long trip, Goku finally makes it to King Kai's planet, and finds a friendly little monkey, whom he believes to be King Kai.
