Director/ CTU Division Director) Mary Lynn Rajskub — Chloe O'Brian (CTU agent) Carlo Rota — Morris O'Brian (Chloe O'Brian's ex-husband) Sean Astin — Lynn McGill (Division; takes over as CTU Director) Kim Raver — Audrey Raines (DOD liaison for CTU) Louis Lombardi — Edgar Stiles(CTU agent) Roger Cross — Curtis Manning (CTU agent; Head of Field Ops) Jayne Atkinson — Karen Hayes(Homeland Security official) Stephen Spinella — Miles Papazian (Hayes' assistant) Jonah Lotan — Spenser Wolff (CTU agent) Danielle Burgio — Carrie Bendis (CTU agent) Kate Mara — Shari Rothenberg (CTU agent) Martin A. Papazian — Rick Burke Thomas Vincent Kelly — Marc Besson Jenny Levine — Valerie Harris Peter Asle Holden — Harry Swinton (CTU security guard) Carl Edwards — Jim Hill (Homeland Security official) Josie Di Vincenzo — CTU Agent Mara Tyler David Joyner — CTU S.W.A.T Agent Jones Michael Roddy — CTU S.W.A.T Agent Smith Tony Wayne — Robin Powers Alex Castillo — CTU Guard Hugo Marci Michelle — CTU Agent Marcy Reynolds Thomas Howell — CTU Guard Henry Billy Chamberlain — CTU Agent Fitzpatrick John McCain — CTU staffer Sentox Nerve Gas Conspiracy Gregory Itzin — Charles Logan Paul McCrane — Graem Bauer Peter Weller — Christopher Henderson Geraint Wyn Davies — James Nathanson John Allen Nelson — Walt Cummings Jeff Kober — Conrad Haas Robert Rusler — Hank José Zúñiga — Joseph Malina Sky Soleil — John Stratton John Butox — Steve Miller Carl Gilliard — Ron Swanson Federal Government officials, employees and associates Gregory Itzin — Charles Logan (President) Jean Smart — Martha Logan (First Lady) Ray Wise — Hal Gardner (Vice President) John Allen Nelson — Walt Cummings (Chief of Staff) Jude Ciccolella — Mike Novick (Senior advisor) Glenn Morshower — Aaron Pierce (Secret Service) William Devane — James Heller (Secretary of Defense) Sandrine Holt — Evelyn Martin (Martha's personal aide) Alla Korot — Suzanne Cummings (Walt's wife) Anita Finlay — Wendy Brown (White House aide) Robb Reesman — Dr. Hill (Martha's personal doctor) Taylor Nichols — Burke David McDivitt — White House staffer Tracy Howe — Secret Service Agent Justin Adams Jason Grutter — Secret Service Agent Doug Masters Tim Mikulecky — Secret Service Agent Mark Wexler Palmer family Dennis Haysbert — David Palmer D. B. Woodside — Wayne Palmer Russian Federation Nick Jameson — Yuri Suvarov Kathleen Gati — Anya Suvarov Russian separatists and collaborators Julian Sands — Vladimir Bierko Mark