Rex is based on the true life story of a young Marine Corporal named Megan Leavey (Kate Mara), whose unique discipline and bond with her military combat dog saved many lives during their deployment in Iraq. When she is assigned to clean up the K9 unit after a disciplinary hearing, Leavey identifies with a particularly aggressive dog, Rex, and is given the chance to train him. Over the course of their service, Megan and Rex completed more than 100 missions until an explosion injures them, putting their fate in jeopardy.
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Kate Mara stars in this US biographical drama directed by Gabriela Cowperthwaite. The film follows young US Marine Megan Leavey (Mara) as she is paired up with aggressive combat dog Rex while serving with the K-9 unit in Iraq. After training Rex, Megan forms a strong bond with her new companion and together they complete a number of missions and are able to save many lives. However, when Megan and Rex are both injured by an improvised explosive device while serving in Ramadi, their futures are thrown into doubt. The cast also includes Common, Corey Johnson and Edie Falco.