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From Donald P. Bellisario, an acclaimed producer, comes "NCIS," a hit spin-off of "JAG," that brings us the inner workings of the government agency that investigates all crimes involving Navy and Marine Corps personnel, regardless of rank or position.

David McCallum Role: Dr. Donald "Ducky" Mallard , Mark Harmon Role: Special Agent Leroy Jethro Gibbs. Pauley Perrette

Role: Forensics Specialist Abigail "Abby" Sciuto . Michael WeatherlyRole: Special Agent Anthony "Tony" Dinozzo . Sasha Alexander

Role: Special Agent Caitlin "Kate" Todd (seasons 1-2) Lauren HollyRole: NCIS Director Jennifer "Jenny" Shepard (episode 55+; recurring previously) .