Sean Penn is on the run in action thriller The Gunman helmed by Taken director Pierre Morel. Based on the Jean-Patrick Manchette novel The Prone Gunman, the pic stars Penn as a former Special Forces soldier and military contractor suffering from PTSD. He tries to reconnect with his longtime love, but first must go on the run from London to Barcelona and across Europe in order to clear his name. Javier Bardem, Idris Elba, Ray Winstone and Mark Rylance also star. Open Road Films releases The Gunman on March 20. Check out the trailer above.