Season 4
The fourth season is set 18 months after season three. Jack is now working for Secretary of Defense James Heller after being fired by CTU due to his heroin addiction. As the day begins, he gets caught up in an elaborate terrorist plot which involves James Heller and his daughter Audrey Raines.
Episodes
1 Day 4: 7:00 A.M.-8:00 A.M. Jan 9, 2005 
2 Day 4: 8:00 A.M.-9:00 A.M. Jan 9, 2005 
3 Day 4: 9:00 A.M.-10:00 A.M. Jan 10, 2005 
4 Day 4: 10:00 A.M.-11:00 A.M. Jan 10, 2005 
5 Day 4: 11:00 A.M.-12:00 P.M. Jan 17, 2005 
6 Day 4: 12:00 P.M.-1:00 P.M. Jan 24, 2005 
7 Day 4: 1:00 P.M.-2:00 P.M. Jan 31, 2005 
8 Day 4: 2:00 P.M.-3:00 P.M. Feb 7, 2005 
9 Day 4: 3:00 P.M.-4:00 P.M. Feb 14, 2005 
10 Day 4: 4:00 P.M.-5:00 P.M. Feb 21, 2005 
11 Day 4: 5:00 P.M.-6:00 P.M. Feb 28, 2005 
12 Day 4: 6:00 P.M.-7:00 P.M. Mar 7, 2005 
13 Day 4: 7:00 P.M.-8:00 P.M. Mar 14, 2005 
14 Day 4: 8:00 P.M.-9:00 P.M. Mar 21, 2005 
15 Day 4: 9:00 P.M.-10:00 P.M. Mar 28, 2005 
16 Day 4: 10:00 P.M.-11:00 P.M. Apr 4, 2005 
17 Day 4: 11:00 P.M.-12:00 A.M. Apr 11, 2005 
18 Day 4: 12:00 A.M.-1:00 A.M. Apr 18, 2005 
19 Day 4: 1:00 A.M.-2:00 A.M. Apr 25, 2005 
20 Day 4: 2:00 A.M.-3:00 A.M. May 2, 2005 
21 Day 4: 3:00 A.M.-4:00 A.M. May 9, 2005 
22 Day 4: 4:00 A.M.-5:00 A.M. May 16, 2005 
23 Day 4: 5:00 A.M.-6:00 A.M. May 23, 2005 
24 Day 4: 6:00 A.M.-7:00 A.M. May 23, 2005