This final "Tarzan" entry from the MGM assembly line is arguably one the least effective of the series, though it certainly has its adherents. It all begins when Boy (Johnny Sheffield), adopted son of Tarzan (Johnny Weissmuller) and Jane (Maureen O'Sullivan), is kidnapped from the jungle by crooked circus promoters Rand (Charles Bickford) and Shields (Paul Kelly) and spirted off to America. This requires Tarzan and his mate to adopt "civilized" clothes and head to New York City, with the troublesome Cheeta the Chimpanzee along for the ride. There are some amusing moments as Tarzan tries to acclimate himself with the Big Apple, and some less amusing ones as Cheeta gets hold of a powder puff and lays waste to an expensive hotel room. The film's highlight, Tarzan's leap from the Brooklyn Bridge, comes at the film's halfway point, and accordingly things slow down considerably during the final reels. Tarzan's New Adventure works better as a stunt than as an official series entry, but it is still preferable to some of the so-so RKO Radio Tarzan films which were to follow. One racially questionable sequence involving black comedian Mantan Moreland has been understandably removed from some TV prints.
by Hal Erickson synopsis