A silent watcher secretly protects Sandra; Pincus, a stowaway aboard the ship where Spike is held, is captured himself.; Jack rescues Dolores and her father from Pancho Villa; Krenon leads a revolt against Queen Zira; Barry and LeGrand escape overboard; With Jim lost, Pierre kidnaps Mary; Axel and Rex are lost in an underground cavern where they find a strange civilization; Dewey attempts to rescue the captain.; A madman believes he can transfer others longevity to himself by killing them.; Jake and Ed are trapped in an abandoned mine with dynamite about to go off.; Slim finally gets the ape back to the circus; Brad, Lorraine, and Prince Kardos escape from the Ape Men; Linda turns Butch and Slim against each other, but it doesn't improve her situation any.; Duval is captured; The voyage finally gets under way; Jim tells Click the story of his life and then begs him not to print it.; Grim is captured and brought before the natives.; Bob finds out that Prospector Jake is a fake and confronts him.