Main characters

Below are the main characters and cast in each season. If you cannot find a character or cast member, please look in the Recurring Characters, Guest Characters or Characters by groups sections.

Note: Kiefer Sutherland has appeared as Jack Bauer in every episode of the series to date. He is the only actor to do so.

Season 1

 * Kiefer Sutherland as Jack Bauer
 * Leslie Hope as Teri Bauer
 * Sarah Clarke as Nina Myers
 * Elisha Cuthbert as Kimberly Bauer
 * and Dennis Haysbert as David Palmer

Season 2

 * Kiefer Sutherland as Jack Bauer (All Episodes)
 * Sarah Wynter as Kate Warner(All Episodes)
 * Elisha Cuthbert as Kim Bauer (all except 2.19 and 2.20)
 * Xander Berkeley as George Mason (episodes 2.01 to 2.15 only)
 * Penny Johnson Jerald as Sherry Palmer (episodes 2.06 to 2.14, 2.16, 2.21 to 2.24 only)
 * Carlos Bernard as Tony Almeida (All Episodes)
 * and Dennis Haysbert as David Palmer (All Episodes)

Season 3

 * Kiefer Sutherland as Jack Bauer
 * Elisha Cuthbert as Kimberly Bauer
 * Carlos Bernard as Tony Almeida
 * Reiko Aylesworth as Michelle Dessler
 * James Badge Dale as Chase Edmunds
 * and Dennis Haysbert as David Palmer

Season 4

 * Kiefer Sutherland as Jack Bauer (All Episodes)
 * Kim Raver as Audrey Raines (All Episodes)
 * Alberta Watson as Erin Driscoll (episodes 4.01 to 4.12 only)
 * Lana Parrilla as Sarah Gavin (episodes 4.01-4.08 & 4.10 to 4.13 only)
 * Roger Cross as Curtis Manning (All Episodes)
 * and William Devane as James Heller (episodes 4.01 to 4.14; 4.22)

Season 5

 * Kiefer Sutherland as Jack Bauer
 * Kim Raver as Audrey Raines (all except 5.20)
 * Mary Lynn Rajskub as Chloe O'Brian
 * Carlos Bernard as Tony Almeida (episodes 5.01; 5.05; 5.11; 5.12; 5.13; 5.14 only)
 * Gregory Itzin as President Charles Logan (all except 5.15)
 * James Morrison as Bill Buchanan (all except 5.17)
 * Roger Cross as Curtis Manning (all except 5.12; 5.17; 5.18; 5.20; 5.23; 5.24)
 * Louis Lombardi as Edgar Stiles (episodes 5.01 to 5.13)
 * and Jean Smart as Martha Logan (all except 5.15)

Season 6

 * Kiefer Sutherland as Jack Bauer
 * Mary Lynn Rajskub as Chloe O'Brian
 * DB Woodside as Wayne Palmer
 * James Morrison as Bill Buchanan
 * Jayne Atkinson as Karen Hayes
 * Carlo Rota as Morris O'Brian
 * Eric Balfour as Milo Pressman
 * Marisol Nichols as Nadia Yassir
 * Peter MacNicol as Thomas Lennox
 * and Regina King as Sandra Palmer