Jack Bauer is back, and under more pressure than ever. "24" returns to Fox tonight for a 12-episode series dubbed "Live Another Day." The series returns almost four years after the show ended its initial run.

Stars Kiefer Sutherland and Mary Lynn Rajskub are back.

"Live Another Day" finds Sutherland's Jack Bauer on the run in London with his closest confident, Rajskub's character Chloe O'Brian.

The two-hour premiere airs tonight at 8:00 p.m. Eastern.