Jack Bauer (Kiefer Sutherland) rejoins the CTU and forms an uneasy partnership   with director Erin Driscoll (Alberta Watson) in the thrilling fourth season of   the hit FOX show that elapses in real-time. When a train crash             orchestrated by terrorists sets of a destructive chain of events, Bauer must   race to prevent the mayhem from getting out of hand. With William Devane, Mary Lynn Rajskub, and Kim Raver.