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Jack Harmon was a member of Jim Phelps' IMF team. In Prague in 1996, he and his fellow operatives were tasked with the job of photographing and apprehending Golitsyn, as well as preventing him from selling the Non-official cover (NOC) list - a comprehensive list of all covert agents in Eastern Europe.
Jack's role in the plan was to take control of the elevators, allowing Ethan Hunt and Sarah Davies to gain access to restricted areas. Jim later betrayed him by opening up a spike above the elevator shaft and forcing the lift that Jack was sitting on to quickly move up, causing him to get impaled by the spike.
- He was portrayed by Emilio Estevez in the first Mission: Impossible film. However, Max Mittleman provides new dialogue for Jack in the game.
- Mittleman also voices Billy Peltzer in the game.