| Dulé Hill as | Charlie (Charles) Young | Deputy Special Assistant to the Chief of Staff |
| Allison Janney as | C.J. (Claudia Jean) Cregg | Chief of Staff |
| Joshua Malina as | Will (William) Bailey | Vice President's Chief of Staff |
| Janel Moloney as | Donna (Donnatella) Moss | Assistant to Deputy Chief of Staff |
| Richard Schiff as | Toby (Tobias Zachary) Ziegler | Communications Director |
| John Spencer as | Leo Thomas McGarry | Former Chief of Staff |
| Bradley Whitford as | Josh (Joshua) Lyman | Deputy Chief of Staff |
| with Jimmy Smits as |
Matthew Vincente Santos | Rep. D-TX |
| and Martin Sheen as |
Jed (Josiah Edward) Bartlet | President of the United States |
| Lily Tomlin as | Debbie (Deborah) Fiderer | President's Secretary |
| Special Guest Stars | ||
| Kristin Chenoweth as | Annabeth Schott | Deputy Press Secretary |
| and Lily Tomlin as |
Debbie (Deborah) Fiderer | President's Secretary |
| Guest Starring | ||
| Suleka Mathew as | Ms. Chakrabarty | Leo's Nurse |
| Paul Schulze as | Terrance Sligh | Reporter |
| NiCole Robinson as | Margaret | Hooper (last name) / Assistant to Chief of Staff |
| Stephen Markle as | Commander Ruiz | in Sit Room |
| Bruce Gray as | Otis | WTO |
| Co-Starring | ||
| Melissa Fitzgerald as | Carol | Fitzpatrick (last name) Assistant to the Press Secretary |
| Timothy Davis-Reed as | Mark | O'Donnell (last name) / Reporter |
| Mindy Seeger as | Chris | Reporter |
| Armando Valdes-Kennedy as | Dave | Santos' Aide |
| David St. James as | Congressman Gibson | Darren (first name) / R-MI |
| Jonatahn Earl Peck as | Godfrey Sr. | Soldier's Father |
| Nick Toth as | 2nd Pundit | |
| Bobby Ray Shafer as | Cable Pundit | |
| Dempsey Pappion as | Lt. Matinez | |
| Sarah Graham Hayes as | Another Deputy | |
| Jill Michelle as | Female Soldier | |
| Meera Patwarohan as | Chakrabarty Daughter | Malti (first name) |
| Thomas Chaney as | Wounded Private |