The Adventures of Tintin partially deaf physicist and a regular character alongside Tintin, Snowy, and Captain Haddock. He was introduced in "Red Rackham's Treasure", and based partially on Auguste Piccard, a Swiss physicist. The leading characters do not initially welcome his presence, but through his generous nature and his scientific ability, he develops a lasting bond with them. Eventually, by the end of "Land of Black Gold", he becomes a resident of Marlinspike Hall. Normally mild-mannered and dignified, Calculus occasionally loses his temper and acts in a spectacularly aggressive manner in response to actual or perceived insults, such as when Captain Haddock belittles his
Snowy (character) of Captain Haddock in "The Crab with the Golden Claws". Before Haddock's appearance, Snowy was the source of dry and cynical side-commentary, which balanced out Tintin's constantly positive, optimistic perspective. When Haddock entered the series, the Captain took over the role of the cynic, and Snowy gradually shifted into a more light-hearted role, having dialog only with Tintin. Snowy is portrayed as brave and is often fearless against much larger creatures when Tintin is threatened. He repeatedly frees Tintin from captivity and saves him from dangerous situations, and will sometimes identify a villain before Tintin. His only fear is arachnophobia.