she plays the role of carrie matheson, a brilliant but psychologically troubled c.i.a. agent. "one of the nation's greatest losses on 9/11 was its illusion of invince ability." claire matheson personified the country's confusion. >> a green spen what i want. >> and blue is what is available. >> green is important. green is necessary. it doesn't make sense if it isn't green and it's really not an unreasonable request. >> carrie? >> oh, thank god. my green pen is dry. i asked four, five, six times far new one but there's no understanding. they offer me blue, they offer me block. is green so saturday? is green elusive? i told them for a [no audio] green pen! is she yours? >> yes. >> she should go to her room. the doctor will be in. >> i amylaser focused. i believe there's more. the things i saw, the avenues here have methods and patterns and priorities, a single sniper, no, no. he would don't that. he never has, he never will. he goes big, he explodes. we know that. >> slow down. slow down. >> we have about a week, maybe less, to figure out the real target. not this "who shot the