Anti-terrorism agent Jack Bauer and his expert team must thwart an assassination plot against a leader from the Middle East who's visiting New York.

1. 4:00 P.M. - 5:00 P.M. 43m Jack Bauer is drawn back into action just as Pres. Allison Taylor negotiates international security with Middle Eastern leader Omar Hassan.

2. 5:00 P.M. - 6:00 P.M. 45m Pres. Taylor negotiates international security plans with Omar Hassan. CTU still has Chloe O'Brian, and adds analysts Dana Walsh and Arlo Glass.

3. 6:00 P.M. - 7:00 P.M. 42m Jack Bauer helps prevent an attempt on Omar Hassan's life. Meanwhile, CTU is challenged by some complicated -- and unexpected -- circumstances.

4. 7:00 P.M. - 8:00 P.M. 46m As Jack Bauer is reunited with Agent Renee Walker, the crisis around an assassination attempt on president Omar Hassan continues to escalate.

5. 8:00 P.M. - 9:00 P.M. 44m Jack Bauer and Renee Walker track some dangerous leads. Meanwhile, Pres. Taylor learns of a threat that jeopardizes the peace accord.

6. 9:00 P.M. - 10:00 P.M. 44m The past catches up to Renee Walker as she deals with a dangerous arms dealer. The Hassan family's turmoil jeopardizes the peace agreement.

7. 10:00 P.M. - 11:00 P.M. 44m Jack Bauer is forced to go further undercover to secure enriched nuclear materials. At the United Nations, Pres. Taylor's goodwill is questioned.

8. 11:00 P.M. - 12:00 A.M. 44m As the scope of the looming threat expands, Pres. Taylor pressures CTU for progress while Jack's perilous plan has operatives panicked.

9. 12:00 A.M. - 1:00 A.M. 44m Pres. Taylor presses on with her international peace process. With the possibility of colossal failure facing CTU, people start assigning blame.

10. 1:00 A.M. - 2:00 A.M. 44m When Jack closes in on a person of significant interest, an already tense meeting between Pres. Taylor and Omar Hassan takes an unexpected turn.

11. 2:00 A.M. - 3:00 A.M. 44m Jack tracks a key terror suspect. Back at CTU, a key player grapples with being demoted, and parole officer Bill Prady enters the picture.

12. 3:00 A.M. - 4:00 A.M. 44m While Jack and Cole team up in the field, a hostage situation has CTU on edge. Meanwhile, parole officer Prady continues his investigation.

13. 4:00 A.M. - 5:00 A.M. 44m As CTU copes with the day's explosive events, the NSA intervenes. Meanwhile, Jack Bauer leads field operatives on a risky mission.

14. 5:00 A.M. - 6:00 A.M. 42m When Pres. Taylor's vision of global peace is foiled, she tasks Jack Bauer with a crucial mission, and advisor Ethan Kanin returns.

15. 6:00 A.M. - 7:00 A.M. 43m Pres. Taylor faces a massive threat as the hunt for the dirty bomb continues. Meanwhile, Pres. Hassan makes a surprise decision.

16. 7:00 A.M. - 8:00 A.M. 44m Trusted allies become enemies of the state, and that's only the beginning of the betrayals as the events culminate in the biggest twist yet.

17. 8:00 A.M. - 9:00 A.M. 44m Pres. Taylor attempts to resuscitate the peace agreement. Unfortunately, she must solicit the services of disgraced former Pres. Logan.

18. 9:00 A.M. - 10:00 A.M. 44m As things become even more personal for an avenging Jack, he heads to CTU for an intense meeting after learning of a devastating development.

19. 10:00 A.M. - 11:00 A.M. 44m Pres. Taylor enlists a private security firm to complete a sensitive task. Meanwhile, Jack calls in a favor to his old friend Jim Ricker.

20. 11:00 A.M. - 12:00 P.M. 43m Jack Bauer will stop at nothing to avenge the loss of his partner. Meanwhile, the administration attempts to keep the peace agreement on track.

21. 12:00 P.M. - 1:00 P.M. 44m With only four hours left, a rogue Jack Bauer stops at nothing to determine who is behind the day's events, and he uncovers an unexpected lead.

22. 1:00 P.M. - 2:00 P.M. 44m Jack Bauer looks to uncover the truth as Pres. Taylor prepares for a signing ceremony. Meanwhile, Pres. Logan faces off with a formidable foe.

23. 2:00 P.M. - 3:00 P.M. 44m Pres. Taylor closes in on a world-changing peace treaty while Jack Bauer takes matters into his own hands for one last and unforgettable job.