Sam and Marcus look for the traitor who stole the nuclear launch key; when Prosser disobeys orders, he starts a conflict he can't control; Grace and James try to defuse a dangerous situation.

Cast: Andre Braugher, Scott Speedman, Daisy Betts, Camille De Pazzis, Dichen Lachman, Daniel Lissing, Sahr Ngaujah, Autumn Reeser, Jessy Schram, Robert Patrick, Jay Karnes, Gideon Emery, Jessica Camacho, Will Rothhaar, David Rees Snell