How Many NCIS Shows Are There In Total And How Are They Different?

The series that ignited the nation's interest in Naval criminal justice has lasted the longest and shows little signs of slowing down. There have been 20 seasons with over 450 episodes released, and a 21st season is already in the works that is set to arrive in 2024.

The unstoppable military police procedural follows the NCIS Major Case Response Team based out of the Washington Navy Yard in Washington, D.C. Led by NCIS Supervisory Special Agent Leroy Jethro Gibbs, played by Mark Harmon, the team included several agents, including Michael Weatherly as Anthony DiNozzo, Sean Murray as Timothy McGee, and Sasha Alexander as Caitlin Todd. Running forensics for the squad behind the scenes was Abby Sciuto, played by Pauley Perrette. And the crew could always count on the expertise of Dr. Donald Mallard, played by the late David McCallum, and Dr. Jimmy Palmer, portrayed by Brian Dietzen. Since its debut, there have been several changes in the lineup, with a slew of recognizable talent being added to the roster, including Cote de Pablo, Wilmer Valderrama, Maria Bello, Jennifer Esposito, Katrina Law, and Gary Cole.

While there are many options to choose from in the franchise, it's clear that fans feel the original series is the best "NCIS" show. Armed with the most episodes, star power, and cases to solve, classic "NCIS" offers an experience just a notch above the rest.