The first five seasons of the popular real-time drama series featuring Federal Agent Jack Bauer (Kiefer Sutherland). Season One - The first episode begins at midnight on the day of the California Presidential Primary. Jack Bauer heads up the government's Counter-Terrorist Unit. He discovers that there's going to be an assassination attempt on Senator Palmer, an African-American presidential candidate. Bauer faces a battle against the clock to avert disaster. Two - Jack Bauer and the Counter Terrorist Unit (CTU) race to prevent a nuclear bomb being detonated by terrorists in Los Angeles in the second season of 24. Three - When the head of a Mexican drug cartel is imprisoned by Jack Bauer (Sutherland), a plot ensues to blackmail the US Government with the threat of a released bio-weapon that will kill millions to ensure his release. With Palmer seeking re-election to a second term, will Jack survive this day? Four - 18 months after day 3, CTU has a new leader, Erin Driscoll, a steely government agent who made firing Jack one of her first priorities. After the explosion of a commuter train, Jack, who is now working for Secretary of Defense James Heller and also is romantically involved with Heller's married daughter, Audrey Raines, suddenly finds himself heading back to CTU for a meeting with Driscoll. Jack believes that the train explosion is a prelude for bigger things to come... Five - Jack is, in fact, living under the name of Frank Flynn and conceals his identity by taking a manual job on an oil rig. However, when President Logan is placed at the centre of a labyrinthine conspiracy involving the signing of a vital U.S. - Russian arms treaty, Jack is forced back into action!