Martinez and his Chief of Staff order their intelligence departments to determine the nature of Thomas' message and who it was sent to. Meanwhile, Thomas launches a surprise attack, Alaskan Senator Catherine Lewis threatens to go on national television to alert the public to the enemy among them, and Sean and Leila get a fresh lead on Samantha's location.
Elenco: Blair Underwood , Zeljko Ivanek , Laura Innes , Scott Patterson , Jason Ritter , Sarah Roemer , Taylor Cole , Lisa Vidal , Clifton Collins , Jr. , Bill Smitrovich , Wes Ramsey , Clea DuVall , Hal Holbrook .