The first five seasons of the popular real-time drama series featuring Federal Agent Jack Bauer (Kiefer Sutherland). In 'Day One', Jack, an agent for the CIA's Counter Terrorist Unit (CTU), is trying to prevent the assassination of a Democratic candidate after a death threat. However, Jack soon finds he's been framed for the assassination himself. He flees in a desperate attempt to find the real perpetrators. Injured, and armed with nothing except his mobile phone and the help of trusted colleague, Jack's situation becomes increasingly precarious. Meanwhile, his teenage daughter has gone missing after sneaking out of the house with her friend. Jack's ex-wife unwittingly puts herself in grave danger when she goes looking for her. 'Day Two' takes place a year later. Having had time off to cope with his wife's death, Jack is now called upon to find a nuclear bomb in Los Angeles. Meanwhile, Kim, who has been working as an au pair, is forced to go on the run from her abusive employer after he attacks her and the little girl she is looking after. But when she takes Megan to the hospital, Kim is arrested for abusing the child. 'Day Three' takes place three years on and Jack has successfully captured and imprisoned the head of a Mexican drug cartel. But when a van deposits a dead body outside the LA Health Unit infected with a deadly virus, the Counter Terrorist Unit uncover a plot to blackmail the US Government with the threat of a released bio-weapon that will kill millions unless a drug baron is released. Jack must infiltrate the gang and rid the world of the virus threat. 'Day 4' takes place 18 months later. CTU has a new leader, Erin Driscoll (Alberta Watson), a steely government agent who has made firing Jack Bauer (Kiefer Sutherland), one of her first priorities. After an explosion on a commuter train, Jack, who is now working for Secretary of Defence James Heller (William Devane), and who is also romantically involved with Heller's married daughter, Audrey Raines (Kim Raver), suddenly finds himself heading back to CTU for a meeting with Driscoll. When it seems that Islamic terrorists are launching an all out assault on the USA, Jack leads CTU's response in a desperate race against time. In 'Day 5' Jack is living under a new alias and working on oilrigs and refineries throughout America. He is living with the Huxley family near the Mojave Desert. An unknown figure orders the assassination of the four people who know Jack is alive--Tony Almeida, Michelle Dessler, Chloe O'Brian and Former President David Palmer--to frame him. When he returns to LA to clear his name a hostage situation erupts. But it is only a diversion by conspirators to obtain 20 canisters of Sentox VX nerve gas.