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 John M. Jackson Actor Karri Turner Ensign, Lt. j.g. Harriet Sims Guest Star Rex Linn Guest Star Steven Culp Guest Star Richard Partnow Guest Star Larry Manetti Guest Star Jon Menick Guest Star Marcy Kaplan Guest Star Corey Joshua Taylor Guest Star Darin Cooper Guest Star Chris Whalley Guest Star Judie Aronson Guest Star Lisa Waltz Guest Star Michael Bellisario Guest Star Donald P. Bellisario Executive Producer, Writer, Director