PA: Due to some graphic violence, viewer discretion is advised.

AS THREAT PEAKS, JACK FACES HIS PAST ON "24" MONDAY, FEBRUARY 27, ON FOX

As the hostiles elevate the threat, a conflicted President Logan disagrees with the advice of First Lady Martha Logan, who then takes matters into her own hands. Meanwhile, CTU honcho Lynn McGill copes with the day's escalating intensity and agent Bauer comes face to face with Christopher Henderson, the federal agent who recruited him to counterterrorist work more than a decade ago. The Russian extremists continue to undermine the historic arms treaty when they plan an act of war that could change the world forever in the episode "Day 5: 4:00 PM-5:00 PM" airing Monday, Feb. 27 (9:00-10:00 PM ET/PT) on FOX. (TWF-510) (TV-14 V)

Cast: Kiefer Sutherland as Jack Bauer, Carlos Bernard as Tony Almeida, Kim Raver as Audrey Raines, Mary Lynn Rajskub as Chloe O'Brian, Roger Cross as Curtis Manning, Louis Lombardi as Edgar Stiles, James Morrison as Bill Buchanan, Gregory Itzin as President Logan, Jean Smart as First Lady Martha Logan.

Guest Cast: Jude Ciccolella as Mike Novick, Nick Jameson as Yuri Suvarov, Kathleen Gati as Anya Suvarov, Peter Weller as Christopher Henderson, Julian Sands as Vladimir Bierko, Glenn Morshower as Agent Aaron Pierce and Sean Astin as Lynn McGill.