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.
Bruce Bennett
as Tarzan
Ula Holt
as Ula Vale
Ashton Dearholt
as P.B. Raglan
Frank Baker
as Maj. Francis Martling
Lewis Sargent
as George
Harry Ernest
as Gordon Hamilton
Dale Walsh
as Alice Martling
Jean De Briac
as Lt. d'Arnot
Merrill McCormick
as Bouchart [Ch.1]
Jack Mower
as Ula's Companion at Resort [Ch.1] / Capt. Simon Blade [Ch.11]
Jackie Gentry
as Queen Maya
Earl Dwire
as Expatriate Scientist
