CTU / Division •
Kiefer Sutherland –
Jack Bauer •
Zachary Quinto – Adam Kaufman •
Paul Schulze – Ryan Chappelle(David Palmer's Brother;
Chief of Staff) •
Wendy Crewson – Anne Packard (Palmer's personal doctor; Palmer's girlfriend) •
Jamie McShane – Gerry Whitehorn (Palmer's press chief) •
Albert Hall – Alan Milliken (Major contributor to Palmer's campaign/Ally of his presidency) •
Gina Torres – Julia Milliken (Wife of Alan Milliken) •
Alan Dale – Jim Prescott (
Vice President of the United States) • Conor O'Farrell – Ted Packard (Anne's ex-husband) •
Michael Cavanaugh – Joseph O'Laughlin (
Secretary of Homeland Security) • Greg Hartigan – Secret Service Agent Berkin • Richard Holden – General Stone
Saunders' family and crew •
Paul Blackthorne – Stephen Saunders (Former soldier and
MI6 agent; turned into terrorist; main villain) •
Greg Ellis – Michael Amador (Seller of biological weapon) •
Lothaire Bluteau – Marcus Alvers (arms dealer; sold the Cordilla Virus; assumed to have a past with Nina Myers) • Salvator Xuereb – Arthur Rabens (one of Stephen Saunders' couriers, has biological weapon in L.A.) •
Alexandra Lydon – Jane Saunders (Daughter of Stephen Saunders) • Joe D'Angerio – Osterlind (Saunders' assistant) •
Gabrielle Fitzpatrick – Diana White (lover of Steven Saunders; help fund Saunders' operation)
Salazar family and associates •
Joaquim de Almeida – Ramon Salazar (Narco-terrorist; Head of the Salazar family) •
Vincent Laresca – Hector Salazar (Ramon's brother; Head of family in Ramon's absence) •
Vanessa Ferlito – Claudia Hernandez (Girlfriend of Hector) • Josh Cruz – Oriol (Claudia's father) • Julian Rodriguez – Sergio (Claudia's brother) • Lorry Goldman – Douglas Shaye (Ramon's lawyer) • Gino Montesinos – Eduardo (Henchman) • Eduardo Garcia – Emilio (Henchman) • Gonzalo Menendez – Pablo (Henchman) •
David Labiosa – David Gomez (Henchman)
Singer family and associates •
Riley Smith – Kyle Singer (First time "drug dealer") • Ted Marcoux – Sam Singer (Kyle's unemployed father) •
Lucinda Jenney – Helen Singer (Kyle's mother) •
Agnes Bruckner – Linda (Kyle's girlfriend) •
Kett Turton – Tim (Kyle's best friend)
National Health Services •
Andrea Thompson – Dr. Nicole Duncan •
Christina Chang – Dr. Sunny Macer
Miscellaneous police / Federal employees / Medical • Paul Vincent O’Connor – Police Chief Hendrix •
Tony Todd – Detective Michael Norris (interrogates Julia Milliken) •
Simon Templeman – Trevor Tomlinson (Agent in MI6 office in LA; killed in gunship attack) •
Maria del Mar – Rachel Forrester •
Kevin Chapman – Kevin Mitchell
Chandler Plaza Hotel staff and guests •
Doug Savant – Craig Phillips (Head of Hotel security) • Paris Tanaka – Maya • Sue Jin Song – Annalie Kim •
Scott Klace – Danny •
Brigid Brannagh – Kathy McCartney
Miscellaneous characters •
Sarah Wynter – Kate Warner (Ex-girlfriend of Jack Bauer) •
Sarah Clarke – Nina Myers (Terrorist; Former CTU agent) •
Geoff Pierson – John Keeler (Republican Presidential Candidate) •
Mark Rolston – Bruce Foxton (professional evidence retriever) •
Carlos Gómez – Luis Annicon (Prison Supervisor; one of Jack's companions in the one year operation that brought down Ramon Salazar) • Kamala Lopez-Dawson – Theresa Ortega (Gael's wife) • JF Pryor – Zack Porter (Drug-dealer) •
Jack Kehler – Kevin Kelly •
Matt Salinger – Mark Kanar •
Rick Garcia – Rick Garcia •
Patrick Fabian – William Cole •
Jenni Blong – Susan Cole ==
24: Season 4==