Other source:
The quarterfinals of the Otherworld Tournament are under way. In his match, Goku faces an aquatic being who fills the ring with water. Underwater, Goku is no match for him. Knowing this, he flies out of the water and aims a Kamehameha wave directly at the ring, blowing his opponent out of it. Goku wins, and is a semi-finalist, along with Tolby from the south, and Maraiko and Pikkon from the west.
