Tarzan heads to Guatemala to look for his friend, D'Arnot and helps Major Matling search Mayan ruins for hidden jewels and an idol holding the formula for an explosive. Guatemalan police pursue Alice and Gordon assuming them as spies. Ula Vale as a mysterious figure is revealed in the final episode to be an undercover government operative.
Chapter 3:
Escaping with the Lost Goddess, Raglan sets a deadly trap to insure his safety, while Tarzan, unaware of the impending danger, leads the expidition into the caves.