Captain Haddock oeuvre", it is inspired by the German French-language film "Captain Craddock". In "The Crab with the Golden Claws", Haddock sings one of the film songs, "Les gars de la Marine". At the time of Captain Haddock's introduction to the series in 1940, the character's manners presented a problem to Hergé. As a sailor, Haddock would need to have a very colourful vocabulary, but Hergé could not use any swear words as he knew his audience included children. The solution reportedly came when Hergé recalled how around 1933, shortly after the Four-Power Pact had come into being, he had overheard a
Captain Haddock the Picaros", when Professor Calculus 'cures' him of his taste for alcohol. In the adventure "Secret of the Unicorn" (and continuing in "Red Rackham's Treasure") he and Tintin travel to find a pirate's treasure captured by his ancestor, Sir Francis Haddock (François de Hadoque in French). With newfound wealth and regaining his ancestral home Marlinspike Hall, Captain Haddock becomes a socialite; riding a horse, wearing a monocle, and sitting in a theatre box seat ("The Seven Crystal Balls"). He then evolves to become genuinely heroic, volunteering to sacrifice his life to save Tintin's own in the pivotal "Tintin in Tibet".