This includes Mark Harmon, who has been married to Pam Dawber for nearly 40 years. NCIS: Origins, the NCIS prequel that serves as CBS's fifth spinoff of the popular franchise, is all about the drama.

Several cast members have been in long-term relationships, including Mark Harmon, who has been married to Pam Dawber since 1987 Earlier this year, Wilmer Valderrama and his fiancée, Amanda Pacheco, ...