Synopsis by Hans J. Wollstein
Chapter 11 of Lost City of the Jungle reveals that Rod Stanton (Russell Hayden) managed to get out before Dr. Elmore's (John Eldredge) office exploded. But with a little help from the duplicitous Captain Hammond (Gene Stutenroth), Malborn (John Mylong), who is the real threat to world peace, is now in possession of both pieces of the broken plaque. According to Hammond, Chief Tonga (Clarence Lung) is the only man alive other than Dr. Elmore able to decipher the hieroglyphics and Sir Eric (Lionel Atwill), Malborn's accomplice, promptly leads an expedition to Tonga's village. Rod, meanwhile, learns about the mission from an all-knowing blind beggar (Frank Lackteen), but is captured as he approaches the village and placed in a guillotine activated by the rays of the sun.