NCIS will be returning for its 21st season, making it the third longest-running US primetime drama series. However, due to recent labor strikes in Hollywood, production on the show has been delayed. The Writers Guild of America's strike recently ended, but the SAG-AFTRA strike is still ongoing, preventing production from starting. Originally scheduled for fall 2023, the release of season 21 is now likely to be in early-mid 2024. In the meantime, fans can look forward to the debut of the new spin-off, NCIS Sydney, which will premiere next month.