A beautiful woman hires an intrepid adventurer to help find her father, who has disappeared in the jungle while searching for a rare and priceless butterfly. Along the way they run into cannibals, a race of Amazon warriors and all the usual attractions one would expect to find in a lost jungle.
Jockey Jack has a bill open with a gangster just released from jail. He somehow manages to parry the gangster's knife attack backstage at a theatre and the latter ends up dead being put into a double bass case. A day later the gangster mysteriously has disappeared, but it turns out that he was carrying a bet ticket for a horse race now worth over a million. A turbulent run for the money begins.
Based on the title character, a World Health Organisation (WHO) doctor and martial arts expert who fights bad guys, created in 1970 by scriptwriter Jean Ollivier and artist Carlo Marcello for "Pif Gadget", a weekly kids' comic book magazine in France.
