Unbroken, Angelina Jolie's second film as a director, which tells the story of Olympic track star and war hero Louis Zamperini, is gearing up for production, having already received a Christmas 2014 release date from Universal Pictures, and two more up and coming actors have joined the cast: Domhnall Gleeson (left) and Finn Wittrock.Jack O'Connell was previously cast to play Zamperini, a track star who became a Japanese prisoner of war during WWII after surviving a plane crash, and they'll be joining him as Phil and Mac, two of the men stranded at sea for 28 days with Zamperini in a life raft after their plane is gunned down.The son of Irish actor Brendan Gleeson has been making his own name for himself in recent years, having first become known in the role of Bill Weasley in the "Harry Potter" movies. He's become an incredibly in-demand leading man in the last few years with major roles in Joe Wright's Anna Karenina and Richard Curtis' upcoming About Time, released in the States on November 1.Wittrock meanwhile is best known for playing Damon Miller on the soap opera "All My Children" with upcoming roles in Darren Aronofsky's Noah, Akiva Goldsman's Winter's Tale, Ryan Murphy's HBO movie "The Normal Heart" and Showtime's "Masters of sex ."Adapted from Laura Hillendbrand's bestselling book about the track star by the prestigious quartet of Joel and Ethan Coen, William Nicholson and Richard LaGravenese, production is set to start in the fall with Jolie producing with Matthew Baer, Erwin Stoff and Clayton Townsend.