An expedition tries to enlist Tarzan's help in finding the secret Blue Valley, which legend says is the location of a miraculous fountain of youth.

The Lionians, a tribe of lion worshippers, make a desperate attempt to find a cure for the mysterious disease plaguing their village. Their Chief decides to kidnap Jane and Lola, a half-breed nurse, in order to help repopulate his civilization. Tarzan must rescue them while fending off blowgun attacks from people called the Waddies who are disguised as bushes.

Escaped convicts are selling weapons to a warlike native tribe.

The jungle king's cousin tries to get him to help find a diamond treasure.

The king of the jungle fights off ivory poachers.