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 Mark Harmon Guest Star Michael Weatherly Guest Star David McCallum Guest Star Robyn Lively Guest Star Pauley Perrette Guest Star Thomas Anthony Jones Guest Star Alan Dale Guest Star Faran Tahir Guest Star Felicia Coppola Guest Star Michael Muhney Guest Star Vyto Ruginis Guest Star Krystal Pertsch Guest Star Zoe McLellan Petty Officer Jennifer Coates Actor W. K. Stratton Guest Star Donald P. Bellisario Executive Producer, Writer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer Scott Brazil Director Don McGill Writer