| Rob Lowe as | Sam (Samuel Norman) Seaborn | Deputy Communications Director |
| Dulé Hill as | Charlie (Charles) Young | Personal Aide to the President |
| Allison Janney as | C.J. (Claudia Jean) Cregg | Press Secretary |
| 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 | Chief of Staff |
| Bradley Whitford as | Josh (Joshua) Lyman | Deputy Chief of Staff |
| and Martin Sheen as |
Jed (Josiah Edward) Bartlet | President of the United States |
| Special Guest Stars | ||
| Mark Harmon as | Simon Donovan | C.J.'s Secret Service Agent |
| Ron Silver as | Bruno Gianelli | Campaign Strategist |
| with John Amos as |
Admiral Percy "Fitz" Fitzwallace | Chairman of the Joint Chiefs |
| Guest Starring | ||
| Evan Rachel Wood as | Hogan Cregg | C.J.'s niece |
| Patrick Breen as | Kevin Kahn | |
| Gerry Becker as | Network News Director | |
| Leon Russom as | Network News Director | |
| Michael Holden as | Network News Director | |
| Thomas Kopache as | Assisant Secretary of State | Bob "Bobby" Slatterly |
| NiCole Robinson as | Margaret | Hooper (last name) / Assistant to Chief of Staff |
| Ned Schmidtke as | Admiral | |
| Co-Starring | ||
| Kim Webster as | Ginger | Assistant to Communications' Director |
| Devika Parikh as | Bonnie | Communications' Aide |
| Melissa Fitzgerald as | Carol | Fitzpatrick (last name) Assistant to the Press Secretary |
| Kate Palmer as | Assistant | |
| Maggie Baird as | Carney | Network News Director |
| Steve Tom as | General | |
| Ivy Jones as | Martha | |
| Ralph Meyering Jr. as | Civilian | Tom |
| David Katz as | Assistant | |
| William J. Jones as | Secret Service Agent | Jamie |
| David Burtka as | Bruce | Intern |
| Penny Griego as | TV Reporter | |
| Richard Saxton as | TV Reporter | Alan |
As for the remaining episodes: Schlamme says he's "excited about where we're headed." The four shows "are all tied together, not as cliffhangers, but all of a piece, leading to a fairly dramatic conclusion."
"Fiction visits fact in "West Wing" salute to the West Wing"
by Gail Pennington
April 24, 2002
St. Louis Post-Dispatch
For starters, it's almost never still. Recalling his memorable guest-arc on "The West Wing" the year before he got "NCIS," Harmon said "the air was different on that set. It was like a train rippin' by a hundred miles an hour, and you were supposed to grab a strap and hang on." - Mark Harmon
"NCIS becomes a hit by stealth"
by Noel Houston
November 25, 2005
Newsday
CJ shops at a nonexistent Barney's on Connecticut Avenue.
"The Reliable Source"
by Amy Argetsinger and Roxanne Roberts
March 5, 2006
Washington Post
Mark Harmon's looks nearly lost him the lead role on "NCIS," the forensic drama with a military flair now in its third season. Series creator Donald P. Bellisario had written the main character, Leroy Jethro Gibbs, as a tough-minded former Marine gunnery sergeant but had no specific actor in mind for the part."Someone mentioned Mark Harmon and I said, 'He's a pretty boy; I just don't see him as this character,'" Bellisario said. But the producer reversed his thinking after watching Harmon in a four-episode 2002 story arc on "The West Wing."
"I had envisioned the boyish Harmon, who was too good-looking, but I saw he now has a maturity to him,"
"The Letters of the Law"
by Kathy Blumenstock
April 2, 2006
Washington Post