The evil Eric Hazarias (Lionel Atwill) has traced a Meteorium deposit to the Himalayan nation of Pendrang, ruled by casino owner Indra (Helen Bennett).

[1] Lionel Atwill was ill and died of lung cancer and pneumonia during the filming of this serial.

Atwill had been cast as the mastermind villain, Sir Eric Hazarias, a foreign spy chief.

Secondly, a double of Atwill was used to complete additional scenes involving the character Hazarias, seen either wearing a disguise or filmed from behind or at a distance.

Thirdly, the script was rewritten so that the character Malborn dominated the first several episodes, with only the disguised Hazarias being seen, while the footage filmed with Atwill as Hazarias, often speaking only a few lines and standing around the set of his cave hideout (because he had been too ill to do much more), was shifted to the last half of the serial and supplemented by lengthy shots of his henchmen describing various of their activities to him.