The fifth season of the American drama television series 24, also known as Day 5, premiered on January 15, 2006, on Fox and aired its season finale on May 22, 2006. The season five storyline starts and ends at 7:00 a.m. – the same time frame as the previous season. The season received overwhelming critical acclaim and is widely regarded as the show's best season. It received twelve Primetime Emmy Award nominations with five wins, including Outstanding Drama Series. Season overview The fifth season is set 18 months after season four. Former Counter Terrorist Unit agent Jack Bauer begins the season, working as a day-to-day laborer at an oil refinery under the alias "Frank Flynn" in Mojave, California. On a monumental day in Charles Logan's presidency, an anti-terrorism treaty with Russian President Yuri Suvarov is about to be signed when events take a tragic turn. Season 5 is one of the 24 seasons that can be divided into three main acts: In the first act, two murders force Jack to reveal himself. He attempts to save innocent people from a plot involving Russian separatists that is rapidly unfolding. In the second act, the terrorists gain control of nerve gas canisters with help from corrupt officials. In the final act, Jack discovers how deep the conspiracy goes and fights against numerous threats to get hold of a recording that implicates President Logan. Major subplots Jack is distraught by the loss of David Palmer and Michelle Dessler. This motivates his crusade throughout the day, with him stating "this is personal" several times. Jack comes into contact with people who thought he was dead, including his daughter Kim Bauer and his former girlfriend Audrey Raines. The First Lady attempts to correct the President's perceived mistakes. The Vice President convinces the President to impose martial law in Los Angeles without approval from the U.S. Congress. Chloe loses two men in her life when one of them dies and the other is apprehended for his involvement in a murder. Bill Buchanan's authority at CTU is undermined first by Lynn McGill and then by Karen Hayes, though both eventually come around to his way of thinking. Summary Former U.S. President David Palmer is assassinated in Los Angeles, California and Jack Bauer is framed for his murder. The assassins also plan to frame Jack for the murders of Tony Almeida, Michelle Dessler and Chloe O'Brian, all of