Hell's Chimney (S02E02)

Another positive case: this time at 30 Rock, as NBC’s Tom Brokaw finds his assistant has been infected via another letter. Ryker shares a tense exchange with the mayor of the city when he requests to shut down the building. At the same time, he faces pressure from his superiors to find a motive for the attacks. Bruce opens up to his therapist about his own growing suspicions of his coworkers. (National Geographic)