Jack Bauer and the Department of Defense [Season 4, Episodes 1-6]

Jack Bauer is out of CTU: he’s got a job working for Secretary of Defense Heller and is in a serious relationship with his daughter, Audrey. But as terrorists begin attacking the United States with a train bombing and the kidnapping of Heller and Audrey, Jack is dragged back into action, tasked by new CTU director Erin Driscoll with saving them.