A serial in 12 chapters. Tarzan goes to Guatemala to find his lost friend, D'Arnot. On the way he helps Major Matling search Mayan ruins for hidden jewels and an idol containing the formula for a powerful explosive. D'Arnot and the idol are rescued, but the idol falls into the clutches of the explorer Raglan.
| Actor | Role |
|---|---|
 Bruce BennettTarzan | Tarzan |
| UUla HoltUla Vale | Ula Vale |
 Ashton DearholtP.B. Raglan | P.B. Raglan |
 Frank BakerMaj. Francis Martling | Maj. Francis Martling |
 Lewis SargentGeorge | George |
| HHarry ErnestGordon Hamilton | Gordon Hamilton |
| DDale WalshAlice Martling | Alice Martling |
 Jean De BriacLt. d'Arnot | Lt. d'Arnot |
| MMerrill McCormickBouchart [Ch.1] | Bouchart [Ch.1] |
 Jack MowerUla's Companion at Resort [Ch.1] / Capt. Simon Blade [Ch.11] | Ula's Companion at Resort [Ch.1] / Capt. Simon Blade [Ch.11] |
| JJackie GentryQueen Maya | Queen Maya |
 Earl DwireExpatriate Scientist | Expatriate Scientist |