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
Ula Holt
Ashton Dearholt
Frank Baker
Lewis Sargent
Harry Ernest
Dale Walsh
Jean De Briac
Merrill McCormick
Jack Mower
Jackie Gentry
Earl Dwire