The Lost Volcano (1950)

Johnny Sheffield is quite an agreeable hero in this jungle adventure story. Tommy Ivo is "David Woods" a young lad who camps on the outskirts of the forest with his zoologist father, his mother and their maid "Nona". Meantime, "Bomba" has been watching them and intent on releasing the animals they have been caging up, visits the youngster and they make friends. When a group of hunters stop by, they reckon the young boy knows the whereabouts of a wonderful treasure so they kidnap him and force him to take them to it. "Bomba" learns of this plight and sets off to rescue him - and to save everyone from an ominously noisy volcano. It's all pretty run-of-the-mill stuff but has enough action, vine-swinging and dastardly baddies to amiably pass 75 minutes; especially if you are prepared to overlook the obvious use of library footage....