Professor Calculus's friend develops a blue-skinned orange that can grow on any kind of land and survive harsh weather (in the manner of Lue Gim Gong) and therefore solve world hunger. The Professor and his friends, however, run afoul of gangsters who also covet the fruit. The adventure takes them from their home in Marlinspike Hall (Moulinsart), a fictional mansion that is presumably in Belgium, to Spain, where Calculus and another scientist are kidnapped.
Jean-Pierre Talbot
as Tintin
Jean Bouise
as Capitaine Haddock
Félix Fernández
as Professeur Tournesol
Jenny Orléans
as Bianca Castafiore
Ángel Álvarez
as Professeur Zalamea
Franky François
as Dupond
André Marié
as Dupont
Pedro Mari Sánchez
as Pablito
