A 10 minute prologue was released detailing what happened to Jack between Seasons 5 and 6.
Find out more here. Season 6 begins at 6:00am, taking place 20 months after Season 5 and roughly 9 years, 2 months after Season 1.
After nearly two years in a Chinese prison, Jack Bauer follows a terrorist trail to the detonation of a nuclear weapon. Jack must also uncover the masterminds behind the nuclear plot, including links to his own family. The main antagonists in this act are Abu Fayed, Darren McCarthy, Graem Bauer and Phillip Bauer.