Monkey (1978)

S1E14 Catfish, Saint and the Shape-Changer

The travelers find themselves in a volcanic region that is constantly shaken by earthquakes, the result of ongoing disputes between two local demons: a catfish demon and a faceless shape-shifter capable of assuming any form. The wise priest San-Chung warns Monkey, Pigsy, Sandy, and Tripitaka that one among them is the shape-shifter. Struggling to handle this unsettling information, they decide to part ways, each taking a different path.