#11: NCIS (2003–present)
NCIS is technically a spin-off from JAG (1995-2005) which is another successful spin-off that’s made our list! NCIS started as a modest spin-off but became one of the most-watched shows, gaining its own successful franchise with spin-offs like NCIS: Los Angeles, NCIS: New Orleans, and NCIS: Hawai’i. When spin-offs create spin-offs!
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