Listen, I'm a big George Zucco fan, I love the old Producers Releasing Corporation 40s C-movies but the 1946 The Flying Serpent is not one of the better offerings. Zucco plays a mad archaeologist who uses a live big flying creature to kill his enemies. The "flying serpent" is a stiff stage prop and if you look hard you can see the strings.
But while that plot worked in Devil Bat it doesn't work here. The scenes with the crusading radio reporter (Ralph Lewis) are very dull and slow down the main action of Zucco getting revenge. By contrast, crusading newspaper reporter Dave O'Brien is outstanding combating Lugosi in Devil Bat. Flying Serpent is a tight, very low budget film that runs 59 minutes. The ending is pretty cool, and lifts the film a bit. It was directed by Sam Newfield and also starred Mary Forbes.