Monkey Meets the Demon Digger - S1.E15

While climbing a mountain, the pilgrims discover a man who's been digging a tunnel through the mountain for the past twenty-two years, to provide an easier route for travellers. Ever-helpful Tripitaka tells his reluctant disciples that they must all stay and help dig the tunnel until it's finished. When Monkey uses his magic to help speed things up, Tripitaka is furious and dismisses him. Without Monkey around, the pilgrims fall into grave danger.