After attempting in vain to save a man from being mauled to death by a leopard, Jungle Jim discovers a vial containing an unknown potion. He takes it to district commissioner Marsden, who identifies it as being from the hidden temple of Zimbalu and brings in Dr. Hilary Parker to head up an expedition with Jim as her guide.
An opportunistic photographer, Bruce Edwards, follows as Dr. Parker seeks what she believes could be a miraculous breakthrough in medicine. A cure for polio. En route to their destination, there's a series of mishaps ...
And that's thanks to future Superman George Reeves who plays the devious Edwards- he's not averse to turning to murder in order to get what he wants. Treasure. He adds a bit of fun in this routine, yet adequately diverting Jungle Jim adventure.
Having said that, there's too many animal interludes that hamper the pace and the drive of the story. But there's some good action, especially at the end with Jungle Jim throwing some natives in the fire. Virginia Grey is quite an interesting character, quite spirited and studious. Lita Baron adds some sizzle. As for Johnny Weissmuller, I find it odd that he's wearing clothes, doesn't say "Ungawa" constantly and doesn't swing on vines, but he does a fine job. And has more lines.