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Mark Gatiss is an English actor, comedian, screenwriter, and novelist. As a writer, Gatiss has worked on such shows as Doctor Who, Sherlock (which he co-created and played Mycroft Holmes), and Agatha Christie's Poirot. He is also a member of the comedy team The League of Gentlemen.

For Disney, Gatiss portrayed Giles Winslow Jr. in the 2018 live-action film, Christopher Robin.

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