Rising Brit thesp Damson Idris has joined the cast of indie drama Meagen Leavey opposite Kate Mara. Gabriela Cowperthwaite directs the biopic based on the true story of Megan Leavey, a young Marine who turned her life around by enlisting in the K9 unit. There, she was teamed with an aggressive combat dog named Rex. The pair formed a special bond and were deployed to Iraq as an elite bomb-sniffing team. Together they served two tours of duty and completed more than 100 missions, saving innumerable lives. Tom Felton, Bradley Whitford, Edie Falco and Will Patton also star.