CBS is planning to celebrate the 20th anniversary of NCIS with a designated NCIS day. To prepare for the show, viewers can watch two episodes from the series JAG, which serve as a two-part backdoor pilot for NCIS. The other spin-offs, NCIS: Los Angeles and NCIS: New Orleans, should be watched in chronological order. Crossover episodes should be watched together, and there are no drastic timeline leaps in the series. NCIS: Sydney is set to premiere, while NCIS and NCIS: Hawaii have been postponed until 2024 due to an ongoing actors' strike.