Special features

Special features are extras included on the 24 DVDs which often show behind the scenes information about the episodes of their respective season.

Season 1

 * Alternative ending
 * Introduction to Season One by Kiefer Sutherland

Season 2

 * "24 Exposed" (production featurette on the last two episodes of Season 2)
 * "24 Exposed" (post-production on the last two episodes of Season 2)
 * "On the Button: Exploding the CTU" (a featurette on filming the terrorist bombing of CTU)
 * Multi-angle scene study (interrogation scene) from 1:00pm-2:00pm

Season 3

 * Season 4 Prequel
 * "24: On the Loose" featurette
 * "Boys and Their Toys" featurette
 * "Biothreat: Beyond the Series" featurette
 * Multi-angle scene study: Episode 12 "Midnight Shootout"

Season 4

 * Season 4 Prequel (director's cut)
 * Exclusive Season 5 Prequel
 * Making of Season 5 Prequel
 * "Breaking Ground: Building the New CTU" featurette
 * "Blood on the Tracks" featurette
 * "Lock and Load" featurette
 * 24: Conspiracy cell phone mobisodes
 * The Longest Day music video
 * 24: The Game demo

Season 5

 * Season 6 Prequel
 * "Supporting Players" featurette
 * "Unsung Heroes: 24 Camera Department" featurette
 * "Music by Sean Callery" featurette
 * "Logan's Retreat" featurette
 * 100th Episode Reel
 * 24: Behind the Scenes book sample

Season 6

 * Day 6 Debrief mobisodes
 * "Master Illusionist: 24's Special Effects" featurette
 * "24 Season 6: Inside the Writers' Room" featurette
 * "24 Season 6: Opening with a Bang" featurette
 * "The Technology of 24" featurette
 * Ricky Gervasi cameo
 * Public Service Announcement from Kiefer Sutherland