Kiefer Sutherland
as Jack Bauer
( 2001 - Present )

Carlos Bernard
as Tony Almeida
( 2001 - Present )

William Devane
as Secretary of Defense James Heller
( 2005 - Present )

Kim Raver
as Audrey Heller Raines
( 2005 - Present )

Roger Cross
as Curtis Manning
( 2005 - Present )

Mary Lynn Rajskub
as Chloe O'Brian
( 2004 - Present )

Gregory Itzin
as President Charles Logan
( 2006 - Present )

Jean Smart
as Martha Logan
( 2006 - Present )

James Morrison
as Bill Buchanan
( 2006 - Present )

Leslie Hope
as Teri Bauer
( 2001 - 2002 )

Elisha Cuthbert
as Kimberly Bauer
( 2001 - 2004 )

Dennis Haysbert
as David Palmer
( 2001 - 2006 )

Penny Johnson Jerald
as Sherry Palmer
( 2001 - 2004 )

Sarah Clarke
as Agent Nina Myers
( 2001 - 2004 )

James Badge Dale
as Chase Edmunds
( 2003 - 2004 )

Xander Berkeley
as George Mason
( 2001 - 2003 )

Alberta Watson
as Erin Driscoll
( 2005 )

Louis Lombardi
as Edgar Stiles
( 2006 )

Sarah Wynter
as Kate Warner
( 2002 - 2003 )

Reiko Aylesworth
as Michelle Dessler
( 2002 - 2005 )