Spoiler Alert for NCIS: Origins season 1, episode 8, "Sick as Our Secrets"NCIS: Origins adds to the story of Leroy Jethro Gibbs in episode 8, explaining how Special Agent Randy (Caleb Foote) fits into what happened to Shannon and Kelly. The NCIS prequel expands on what happened to Gibbs' wife and daughter in NCIS, bringing new perspectives into the mix to develop the story while revisiting cherished NCIS lore. "Sick as Our Secrets" highlights Benjamin "Randy" Randolf, an agent on Franks' team tasked with showing Gibbs the ropes at Nis. However, episode 8 reveals Randy is more deeply connected to Gibbs, though Leroy doesn't know about it yet.

The prequel's first season reintroduces NCIS franchise characters like Vera Strickland and Mike Franks, well-established in the main series. Still, the NCIS: Origins cast like Randy and Lala Dominguez (Mariel Molino) add even more to the series, bringing in completely new stories rather than retelling old ones.