After the David Palmer-centric plots of previous seasons, Season 4 (originally aired in 2005) took a bold risk. Jack Bauer (Kiefer Sutherland) is no longer a CTU agent. He works for Secretary of Defense James Heller, and his daughter is dating Heller’s rebellious daughter, Audrey Raines.
If you have a video file of 24 Season 4 (typically a re-encode from Blu-ray or HDTV), the embedded subtitles may be missing or out of sync. For reliable, sync-timed English subtitles :
The theft of the "Nuclear Football" to launch a warhead directly toward Los Angeles. A Changing of the Guard
Avoid files labeled "HC" (Hard Coded) unless you are certain they are correct.