Tarzan and the Future King

Tarzan meets with King Torg of the Red Gorilla Kingdom where Prince Yaru is to inherit the throne of the Red Gorilla Kingdom. Prince Yaru's final test is to return with a branch from the olive tree on Mount Mammoth with no help whatsoever. Yet King Torg's Vizier has other plans which involves seeing that Prince Yaru fails and that the Vizier will get the throne.