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 Ben Murphy Guest Star Ian Ogilvy Guest Star Erik King Guest Star Pamela Tyson Guest Star Kathleen Lloyd Guest Star Paul Collins Guest Star Gregory White Guest Star Jack Yates Guest Star Donald P. Bellisario Executive Producer Alan J. Levi Director Larry Moskowitz Writer