The NCIS Universe is constantly expanding — and fans have become enthralled with the original cast and the spinoff actors’ romances, both on and off screen. NCIS debuted in 2003 as a backdoor pilot for JAG, which ran from 1995 to 2005. NCIS, which originally starred Mark Harmon as Leroy Jethro Gibbs, concluded season 22 in May 2025. Prior to that season — and thanks to the addition of spinoffs, including NCIS: New Orleans, NCIS: Los Angeles, NCIS: Hawai’i and NCIS: Sydney, the NCIS franchise reached 1,000 total episodes in April 2024. Prequel series NCIS: Origins premiered that October, adding...

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