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Alanna Mitsopolis, portrayed by Vanessa Kirby, is a formidable arms dealer and the "White Widow" in the Mission: Impossible franchise. She is known for her exceptional combat skills, cunning intellect, and unwavering determination. Mitsopolis's high-intensity role adds depth and complexity to the action-packed series, making her a compelling and formidable adversary for Ethan Hunt and his team.