Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor Sasha Alexander NCIS Special Agent Caitlin Todd Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor David McCallum Dr. Donald "Ducky" Mallard Actor Brian Dietzen Jimmy Palmer Guest Star Stacy Edwards Cmdr. Janice Byers Guest Star Jessica Steen NCIS Special Agent Paula Cassidy Guest Star Billy Brown Chief Petty Officer Velat Guest Star Mary Wickliffe Nurse Dooley Guest Star Michael Dempsey Coach Morgan Guest Star Matthew Ness Spencer Guest Star Nathan Wetherington Ensign Evan Hayes Guest Star Ben Ziff Jonathon Guest Star Derrex Brady Navy Corpsman Guest Star Tyler Kain Tiffany Guest Star Donald P. Bellisario Executive Producer Dennis Smith Director George Schenck Writer Frank Cardea Writer