Jacques Careuil, Claude Bertrand, Micheline Dax, Serge Nadaud, Guy Piérauld, Paul Rieger, Jacques Vinitzki, Marie Vinitzki, Henri Virlogeux
Tintin is sent to guard Professor Calculus, who has invented a machine that can duplicate anything, and is staying in a village near the border of Syldavia and Bodouria. Rastapopoulous, an infamous and ruthless international criminal, tries to lure Calculus and Tintin away by kidnapping two children, who live nearby, in order to get his clutches on the machine.