There are good reasons why I watched the Weissmuller Tarzan films as a kid and not the Jungle Jim films. The television stations were too embarrassed to show them.
This film starts with stock footage of wild animals from Africa and Asia, I guess at the time most people did not notice the difference.
Jungle Jim investigates Gorilla attacks in an area where there should be not gorillas and although these gorillas look like men dressed up in a gorilla costume, it is because they are men dressed up as gorillas and trying to frighten other humans.
The reasons being that some dastardly Nazis are trying to retrieve some Nazi gold hidden during the war.
Weissmuller looked old and flabby, the plot is flimsy and silly. Even as a B film this is just bad.