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 5:
Locating Raglan in a cheap hotel at Puerto Barrios, Tarzan recovers Martling's document, but henchmen come to the rescue of the adventurer and attack Tarzan before he can secure the Goddess.