This serial has a lot of action and good excitement, and Tom Tyler is very likeable as the Phantom. He is the best thing about the serial. The supporting as is good, including a small army of the villain's henchmen!
Another plus about this serial is the super-intelligent German Shepherd dog, Devil, the Phantom's loyal--and invaluable--associate and friend.
Among the supporting cast, the professor's niece was attractive and did a good job. I thought the professor himself gave a somewhat weak performance: he seemed so old, he was almost decrepit, in my view, and not very sharp mentally somehow. If you like serials with a jungle setting, you will enjoy this one.