The Lost Empire.

American journalist Nick Orton is caught up in the world of Chinese gods and monsters while on a search for the long lost manuscript to 'Hsi Yu Chi' (The Journey to the West) by Wu Ch'eng En. He is accompanied on his journey by a humanoid ape with incredible strength and magical powers, a humanoid pig-man, and his brother-in-arms, an ex-cannibal. Based on one of the greatest stories in Chinese history.