as Langston Graham (seasons 1, 2 and 5) Matthew Bomer as Bryce Larkin (seasons 1 and 2) C.S. Lee as Harry Tang (season 1) Rachel Bilson as Lou Palone (season 1) Mini Andén as Carina Miller (season 1, 3 and 4) Tony Hale as Emmett Milbarge (season 2 and 3) John Larroquette as Roan Montgomery (seasons 2 and 4) Nicole Richie as Heather Chandler (seasons 2 and 4) Jordana Brewster as Jill Roberts (season 2) Arnold Vosloo as Vincent Smith (season 2) Chevy Chase as Ted Roark (season 2) Scott Bakula as Stephen Bartowski (seasons 2 and 3) Morgan Fairchild as Dr. Honey Woodcomb (seasons 2 and 4) Brandon Routh as Daniel Shaw (seasons 3 and 5) Kristin Kreuk as Hannah (season 3) Steve Austin as Hugo Panzer (seasons 3 and 4) Mekenna Melvin as Alex McHugh (seasons 3-5) Linda Hamilton as Mary Elizabeth Bartowski (seasons 4 and 5) Timothy Dalton as Alexei Volkoff (season 4) Mercedes Masohn as Zondra Rizzo (season 4) Lauren Cohan as Vivian McArthur (season 4) Ray Wise as Riley (season 4) Robin Givens as Jane Bentley (season 4) Richard Burgi as Clyde Decker (seasons 4 and 5) Carrie-Anne Moss as Gertrude Verbanski (season 5) Angus Macfadyen as Nicholas Quinn (season 5) Production Conception Josh Schwartz and Chris Fedak wrote the script for the first episode, which was initially given a put pilot commitment by NBC before a pilot order was green lit by the network in January 2007. Schwartz and Fedak both attended the University of Southern California. Fedak pitched the idea to Schwartz, who agreed to develop the project with him. Joseph McGinty Nichol, Schwartz's fellow executive producer on The O.C., directed the first hour of the series and consequently became an executive producer via his production company, Wonderland Sound and Vision. Fedak, Peter Johnson, Scott Rosenbaum, Matthew Miller, and Allison Adler also serve as co-executive producers. NBC gave the series an early pick-up and a thirteen-episode order on May 10, 2007. On November 26, 2007, TV Guide reported that NBC had picked up the series for a full, 22 episode season. Casting Zachary Levi and Adam Baldwin were the first two to be cast in February 2007 in the roles of Chuck Bartowski and veteran NSA agent Major John Casey, respectively. Fedak always had Baldwin in mind for the role of John Casey and the producers found that the actor was a "perfect