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The Bourne Supremacy is a 2004 American action-thriller film starring Matt Damon as Robert Ludlum's character Jason Bourne, a former CIA assassin suffering from psychogenic amnesia trying to learn more of his past when he is enveloped in a conspiracy involving the CIA and Treadstone. Franka Potente, Brian Cox, Julia Stiles, Karl Urban, Gabriel Mann, and Joan Allen also star. Based on the novel of the same name, it is the sequel to The Bourne Identity (2002), and was directed by Paul Greengrass and written by Tony Gilroy. Following the success of the first film, Greengrass was hired to replace Doug Liman as the director of the sequel after the producers were impressed by his work on Bloody Sunday (2002).