By 1955, the original Tarzan, Johnny Weissmuller, had long since retired, and RKO Pictures tried several replacements. Tarzan's Hidden Jungle was the first of six films starring Gordon Scott as the ape man. It also was the last of 12 Tarzan pictures released by RKO Studios, and other studios subsequently stepped in to try to carry on the long-running franchise. The villain is a bounty hunter named Burger (Jack Elam), who has invaded the jungle in search of ivory, lion skins, and even animal fat. Tarzan thwarts his schemes with the help of the usual herd of elephants. He also spends a lot of time aiding a noble physician, Dr. Celliers (Peter Van Eyck) and his nurse, Jill Hardy (Vera Miles). Miles and Scott were married after the film was shot. Cheta the Chimp is joined by fellow chimps Lucky and Zippy, the latter of which was a mainstay on television's Howdy Doody series.
by Michael Betzold synopsis