After a ruler dies, tradition dictates the new ruler must accomplish a series of harrowing challenges whilst competing with other aspirants. One of them, a young prince, gets Tarzan's protection in the contest.

After the death of the monarch of an indigenous tribe in the heart of the vast Chilean jungle, Nasu, the deceased's son, becomes the rightful heir. However, Ukali, a violent mercenary, is not willing to take this situation lying down. To become king, Nasu must retrieve the sacred idol of the Great Green God, hidden somewhere in the virgin forest. In the meantime, Tarzan, protector of the innocent and friend of the deceased ruler, decides to lend a helping hand, knowing that the impenetrable jungle is a dangerous place for a young boy. Can Tarzan stop vicious Ukali and help the kind Brown Prince sit on the throne?—Nick Riganas