A lot happens as the first hour unfolds. There is a threat of a nuclear weapon being exploded over Los Angeles. Returning to the first season, Jack has gone into hiding after his wife is killed. His daughter Kim has become estranged from him. So when Jack is needed by the forces set on stopping this terrorist, he decides to take a pass. That is until he realizes all the people he runs across that morning are going to be dead (likely, 2,500,000 of them). What he does in response, of course, is to begin playing by his own rules. Meanwhile, Kim, whose life is in danger from the bomb, is in the middle of an ugly relationship where she is working as a nanny. There are other peripheral characters involved.