Five Sutras who are possessed by Sanzo and his comrades are needed for reviving Gyumao the Bull Satan. Trailing the Sutras, Kogaiji, Son of Bull Satan, crosses the desert and meets the heroes. Goku wants to help Sanzo, who is greatly weakened by scorpion poison but Kogaiji challenges him to a duel and proves to be an extraordinary warrior. Goku fears he cannot defeat Kogaiji with his normal power.