tarzan and the great river (1967)

aka Tarzan and the Big River.
"Can I feed the lion?"
Tarzan (Mike Henry) drops in on the Brazilian jungle, to investigate a tribal cult that is destroying native villages and enslaving the survivors. Along the way he meets and helps out a doctor (Diana Millay), who is trying to get the villagers to accept inoculation against a virulent plague.
Hardly something that I would recommend going out of your way to see, but if its on, and there is nothing else, it will fill 90 minutes.