In the unexplored jungles live the native tribes ruled by The Phantom. A supreme ruler who has taught them to live together in harmony. The sound of the tom tom's breaks the peaceful stillness, alerting the leaders to gather together for a meeting. The chiefs, medicine men, high priests and witch doctors begin to gather at Atonga village to await their leader and counselor, The Phantom.

Professor Davidson possesses part of the map that shows how to reach the Lost City of Zoloz. In order to take his expedition there, he must find the missing part of the map. Singapore Smith, certain there is treasure buried in Zoloz, plans to double-cross Davidson. Meanwhile, The Phantom is trapped by another faction, headed by Dr. Bremmer, a secret agent head of a ring of foreign saboteurs.

The Phantom discovers that a number of white outlaw's plan to attack the Davidson expedition. He manages to rescue the safari and is pursuing the jungle desperados.

The Phantom tries to save the Lost City of Zoloz from a local crook and a Nazi agent with plans to destroy the natives' land to build an air base.

The Phantom tries to save the Lost City of Zoloz from a local crook and a Nazi agent with plans to destroy the natives' land to build an air base.

Byron and Mokue, on their way to Sitanna, run into an ambush. The Phantom rescues them and learns of the gun runners plans. He races to forestall them at Omdor Gorge.