Xavier Von Zwack is a fictional character and a main antagonist in the 2018 film Mission: Impossible - Fallout, played by Henry Cavill. He is a former MI6 agent turned rogue and a skilled operative.

Von Zwack was a highly skilled and decorated agent who worked for MI6. However, he became disillusioned with the agency and its methods, leading him to defect and work as a freelance operative. He eventually becomes a key player in a global terrorist plot.

In the film, Ethan Hunt (Tom Cruise) and his team must stop a global catastrophe caused by a terrorist group known as the Apostles, who have acquired three plutonium cores. Von Zwack, posing as a British agent, infiltrates the team and becomes a thorn in their side. He is a formidable opponent, using his skills and knowledge to evade and outmaneuver Ethan and his team.