Overview
- Both hours revolve around Tommy "Peaches" Mulligan, whose prison escape triggers a present-day reopening of a 1990s NCIS investigation.
- Mark Harmon reprises Leroy Jethro Gibbs as the franchise links the prequel's timeline to the current team, with Austin Stowell portraying the younger Gibbs in Origins.
- The crossover is anchored by NCIS: Origins Season 2's "Funny How Time Slips Away" and NCIS Season 23's "Now and Then."
- Roma Maffia returns as Vera Strickland, serving as a key connection between past events and the current casework.
- Looper highlights three episodes as useful context for viewers: Season 6's "Semper Fidelis," Season 8's "Swan Song," and Season 11's "Under the Radar."