As Screen Rant points out, the only character to make the jump from ill-fated spinoff “NCIS: Red” to the mighty main show was Scott Grimes’s character, agent Dave Flynn. The actor reprised his role in 2017, several years after the spin-off was canned in a Season 8 episode of “NCIS: Los Angeles” titled “Getaway.” Flynn traveled to the San Francisco branch of the NCIS cyber office, so he could cover for Nell Jones (Renée Felice Smith) and Eric Beale (Barrett Foa) while they went undercover and attempted to stop a plot to hack the United States Treasury Department.
Sadly, only Flynn has returned since “Red” failed to materialize in 2013, but fans are still happy to see showrunners at least acknowledging the existence of the mobile team. He hasn’t popped up again since, but the door is open for Flynn to return the next time his colleagues need some assistance. According to Pop Culture, Grimes also featured in a 2011 episode of “NCIS” as an entirely separate character, prior to “Red” even gestating.
As The Express points out, “NCIS” actually started life as a backdoor pilot itself, with several agents being introduced to viewers via an appearance on hit show “JAG.” There’s been fan speculation that “Red” might have got off to a better start if it had launched from “NCIS” directly, as “NCIS: New Orleans” did, but unless CBS reconsiders it, we’ll sadly never know what could’ve been.