Jack makes the ultimate sacrifice to win back Syd, who's torn between reporting his recent sins and allowing Irina to pay dearly for her past crimes; Vaughn learns an awful truth about the contents of Khasinau's “red ball”; Sloane digs up a shocker about his wife's burial site; and Will scores a top-secret assignment that could blow the lid off of Project Christmas. Douglas: Stephen Markle. Devlin: James Handy. Irina: Lena Olin. Will: Bradley Cooper.