As Tangseng and his three disciples continue on their westward journey, they meet the king of Scarlet Purple Kingdom. The king is gravely ill, sick with grief over the loss of one of his wives who was abducted by a nearby demon king. Sun Wukong pretends to be a doctor and attempts to cure the king with a treatment not found in any medical textbook. Then he goes to rescue the imprisoned queen, leading to an earth-shaking confrontation with the demon...