After Season three, season four of 24 tv show (2005) opens for 18 months. Jack is known as the Secretary of Defense, as James Heller, is fired by the CTU, he was a heroin addict. He gets himself attached to terrorist’s plan, which involves the daughter of Heller, Audrey Raines, with two other men. Audrey Raines acts as the chief policy assistant and acts as Jack’s lover. Jack gets the CTU Director of Field Operations given by Erin Driscoll, acting as the Chief Director of CTU, and the lady who opted to fire him but later on realizes she made a boo boo in making a bad decision.

This season, it focuses on one enemy whose name is Habib Marawan, a known leader of a network of terrorist groups around the world, and has decided to target the United States. The whole running of the episode continues to ran on, quite different from the original plan, of six episodes, as the producer were very caught by surprised by Arnold Vosloos performance antics as Marwan! He did end up to be the most hated villain this season, quite contrary to the original complicated enemies and conspiracies of the last season!

The fourth day, is quite different, as there are two unique story lines, as the threat of Marwan comes up one after another:-

1. The planned kidnapped for ransom and bloody killing of the Secretary of Defense.
2. Shooting and bombing the Nuclear power plants all over the United States.
3. Stealing a stealth fighter to shut down Air Force One.
4. Marwan fights Jack to get the nuclear center in America.
5. Terrorists stealing a nuclear missile and launching it for the final meltdown!