Tarzan and the Green Goddess (1938)

While searching for an old friend in the Guatemalan jungle, Tarzan stumbles upon a lost temple. There he begins to hunt the legendary "Green Goddess," an ancient Mayan relic containing a priceless secret formula, which could be a danger to humanity if acquired by unscrupulous characters. Tarzan And The Green Goddess is known as the first, and one of the only, films to ever have Tarzan speak fluent English.