Jolyon Wagg, character in the comics series The Adventures of Tintin
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Wagg appears four times in The Calculus Affair: inviting himself inside Marlinspike Hall, interfering with a critical radio transmission (Haddock was attempting to call the police while pursuing Calculus's captors but Wagg assumed that he was joking), repeatedly interrupting Haddock's phone call to Nestor, and moving into the Marlinspike Hall with his family for a holiday while Tintin, Haddock and Calculus are away.
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In the final Tintin album, Tintin and the Picaros, the tables are turned when Tintin and the Captain steal the costumes from the group with which Wagg is traveling.