The story:
Making his first appearance on the Phantom Sunday pages (for his first daily strip appearance, see D106 Rex, the Missing Heir), Colonel Worobu of the Jungle Patrol requests advice from his unknown Commander when the famous anthropologist Dr. Weeber and his daughter go missing in the Misty Mountains whilst on the verge of a "fantastic discovery".

Taking over the case, the Phantom catches up with the lost pair, completely unaware that he soon will be standing face to face with a phenomenon an injured Dr. Weeber calls "a link between ape and man"...