Dupond et Dupont
In The Secret of the Unicorn, Barnaby and Ivan Ivanovitch Sakharine are completely missing from the storyline. Marlinspike Hall has been renamed "Hudson Manor". Max Bird escapes in his car, but in this version, he is pursued by Tintin, Haddock, and Thomson and Thompson. They fight him on a pumpkin farmer's truck and pursue him with help from a pilot. Aristides Silk (the pickpocket) has been renamed "Herbert Knill".