Tarzan discovers a tribe of giants who appear to be descended from lost English settlers of an earlier century. The giants' village -- and presumably the giants -- is destroyed in a volcanic eruption.; Tarzan is captured by a band of shiftas. He is rescued by a group of baboons whose leader he had nursed back to health.; Dan-El and Natongo reach the mountains of Dan-El's people. They find a tunnel through the mountains and emerge in a burial chamber of kings.