Spoiler Alert for NCIS: Origins season 1, episode 4, "All's Not Lost"NCIS: Origins episode 4 continues to build the backstory of NCIS Agent Leroy Jethro Gibbs. Mark Harmon played the character for 19 years on the show until Harmon's NCIS exit in season 19, episode 4. It wasn't clear whether the series would survive when the actor retired. Several years later, Harmon's original show is now in NCIS season 22, and there is a prequel show about the central character's career origins as an NCIS agent. The bona fide television institution hasn't suffered from Harmon's departure but has grown with the actor's executive producer roles within the franchise.

Austin Stowell is Gibbs in NCIS: Origins. Stowell paints a new picture of the agent, in line with Harmon's character, while contrasting the more composed Agent-in-Charge. Still, Harmon is integral to the series. Harmon narrates NCIS: Origins as his version of Gibbs, who is shown on camera retired in Alaska.