In NCIS: Origins Season 1, Episode 1, "Enter Sandman," a young Leroy Jethro Gibbs, portrayed by Austin Stowell, embarks on his journey as a Naval Investigative Service agent. Set in the early '90s, Gibbs grapples with personal loss while navigating a complex case alongside mentor Mike Franks. This gripping premiere sets the stage for themes of resilience and transformation as Gibbs confronts his past and future challenges.