Other source:

Still training with Mr. Popo, Goku can not yet harness his ki. Back on the ground, Tienshinhan, Krillin, Yamcha, and Chaozu each try individually to stop the flow of lava towards the defenseless village. Just as it looks like the threat has passed, the volcano erupts again with even more power. This time the four warriors work together to avert the magma for good. Training continues as the next Martial Arts Tournament is only three years away.