David James Elliott Lt., Lt. Cmdr. Harmon "Harm" Rabb, Jr. Actor Catherine Bell Maj., Lt. Col. Sarah "Mac" MacKenzie Actor Patrick Laborteaux Lt. j.g., Lt. Bud Roberts Actor Karri Turner Ensign, Lt. j.g. Harriet Sims Actor Scott Lawrence Cmdr. Sturgis Turner Actor Zoe McLellan Petty Officer Jennifer Coates Actor Chris Beetem Lt. Gregory Vukovic Actor Brian Britt Guest Star Danneel Ackles Guest Star Joyce Guy Guest Star Mel Harris Guest Star Orlando Pabotoy Guest Star Tzi Ma Guest Star Charles Rahi Chun Guest Star Jesse Tyler Gullion Guest Star Michael Bellisario Guest Star Steve Ryan Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer Richard Compton Director Darcy Meyers Writer