When the legal drama "JAG" premiered in 1995, nobody realized it was the start of one of TV's biggest franchises. Curiouser still, the franchise it birthed rarely ventured back into the courtroom, with its first spin-off, "Navy NCIS: Naval Criminal Investigative Service," setting the tone for all that would follow, with a mix of military action, investigative mystery, and police procedural.

Arriving in 2003, "NCIS" originally starred Mark Harmon as gung-ho NCIS agent Jethro Gibbs, and for nearly 20 years he put all manner of criminals behind bars and solved any number of military mysteries. During its decades on the air, Gibbs was joined by the likes of Sam Hanna (LL Cool J), Dwayne Pride (Scott Bakula), and Michelle Mackey (Olivia Swann) in a series of spin-offs that took "NCIS" across t

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