TMDb/NCIS TV NCIS celebrates its 500th episode milestone tonight. Watch the landmark event as the team faces a dire threat that could disband them forever. March 25, 2026 AceShowbiz - NCIS is marking an extraordinary achievement as it approaches its 500th episode tonight, March 24, airing at 8 p.m. ET/PT on CBS. After nearly 23 years on the air, this milestone highlights the enduring popularity of the crime procedural that began as a spin-off of JAG in 2003. Created by Donald P.