Donald P. Bellisario Creator, Executive Producer Don McGill Creator Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Katrina Law NCIS Special Agent Jessica Knight Actor Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Margo Harshman Delilah Fielding Guest Star Jaclyn Aimee Esme Guest Star Juliette Goglia Evelyn Shaw Guest Star Patrick Luwis Mike Guest Star Claire Gillies Christine Guest Star Jesse Conrad William Watson Guest Star Adam Cropper Jared Clarkson, Jared Baker Guest Star Zachary S. Williams Logan Kennedy Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Mark Harmon Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer Katherine Beattie Writer Claudia Yarmy Director