https://collider.com/ncis-origins-crossover-explained/

Is time travel really off the table?

Mark Harmon to return as Gibbs on NCIS: Origins as part of a Veteran’s Day crossover event (https://variety.com/2025/tv/news/ncis-mark-harmon-gibbs-origins-crossover-1236563588/)

Harmon, who narrates NCIS: Origins, will make his first on-screen appearance as Gibbs since the prequel series’ 2024 pilot. The crossover event airs on Nov. 11, starting with NCIS: Origins at 8 p.m. followed by NCIS at 9 p.m. According to the official description, “younger Gibbs (Austin Stowell) and team investigate the small-town death of a naval officer in the ‘90s — a case that’s unexpectedly re-opened in the present day.”