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 Trevor Goddard Guest Star Karri Turner Ensign, Lt. j.g. Harriet Sims Guest Star Chuck Carrington Guest Star Cindy Ambuehl Guest Star Steven Culp Guest Star Matt Mulhern Guest Star Kate Jennings Grant Guest Star Josh Taylor Guest Star Robert Lipton Guest Star Ramsey Malouky Guest Star Deeny Consiglio Guest Star Gonzalo Menendez Guest Star Marty Yost Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Terrence O'Hara Director Doug Stark Writer