The evil knight Torchesac, who is at the service of the sinister lord of La Mortaille, gets a very powerful magic flute and uses it for evil purposes. Johan and Pirlouit, assisted by the magician Homnibus, travel to the land of the Smurfs, the only manufacturers of this sort of instrument, to get a new one and battle the usurpers.
William Coryn
Michel Modo
Jacques Dynam
Henri Crémieux
Michel Elias
Ginette Garcin
Henri Labussière
Georges Atlas
Roger Crouzet
Jacques Ciron
Georges Pradez