Jack faces a showdown with a man he thought was long since dead. But while Rex takes extreme action, is it too late to prevent the collapse of society?

Cast: John Barrowman, Eve Myles, Mekhi Phifer, Alexa Havins, Lauren Ambrose, Kai Owen, Bill Pullman, Arlene Tur, Teddy Sears, Tom Price, Marina Benedict, Candace Brown, Megan Duffy, Nayo Wallace, Constance Wu