The NEW ADVENTURES behind-the-scenes was a real-life soap-opera. The producer, Ashton Dearholt, first met ERB in 1929, at which point ERB fell in love with Dearholt's wife (but presumably didn't act on it). MGM wanted Herman Brix, but due to an injury, they went with Weismuller instead. Though he publicly supported MGM's films, ERB, as usual, was very unhappy with the way Hoollywood contionued to portray his character. After MGM's 2-picture deal, he formed a company with Dearholt to do Tarzan properly. While scounting locations in Guatemala, Dearhold fell in love with his leading lady, Ula Holt. On return to Hollywood, he brought her back and installed her in his home-- which did NOT thrill his wife! She left, taking the kids... and soon after, MARRIED ERB!! (Is this nuts?)
Dearholt played the main villain in the picture, Raglan.
Just before their "expedition" began, Dearholt ran out of money, so ERB wound up putting up the rest to make the picture. Now low on cash, he went back to MGM and extended their deal, which is how we got 4 more MGM pictures. Lousy sound equipment saw to it NEW ADVENTURES had terrible sound, and low budget and lack of an actual studio is probably why it wasn't tweaked on return to Hollywood. When the serial was ready to go, MGM, not wanting competition, threatened all their theatres that if they ran Dearholt's picture, they would not get MGM's next Tarzan film. (Those greedy bastards!) Most complied. The film did very well overseas, but almost no one in the US got to see it. So ERB wound up shooting himself in the foot with that 2nd MGM deal.
After a careful reading over at the ERBzine site, I've discovered that the 1st feature version contains material from only Chapters 1-2 (Ch. 1 must have been a REALLY long chapter!!) as the big scene with the machine-gun mowing down countless savages only takes place in Ch.2. The 2nd feature, TARZAN AND THE GREEN GODDESS, comprised highlights from Chapters 2-12!! Totally nuts.
Inexplicably, 20 years after it was made, the NEW ADVENTURES feature was re-dubbed in England. But along the way, Tarzan's voice was replaced by an annoying nasal voice. On my bad prints taken from a local station in the early 80's, I noticed Tarzan's voice is completely different between the 2 features. Apparently, the UK redub is the only version of the 1st feature curtrently known to exist. (Is this insane??)
Despite ALL that, I got a kick out of watching them again. Brix looks and feels like the real guy, and his tree-swinging is at least as impressive (if not more so) than Weismuller. If it hadn't been for MGM's deliberate sabotage, there might have been more of these. By the late 30's, Brix took acting lessons, changed his name to Bruce Bennett, and spent the rest of his career trying to distance himself from the character of Tarzan.