In January 2024, CBS announced a straight-to-series order for the spinoff, which will be set in the early ’90s and follow a young version of Harmon’s longtime NCIS protagonist Leroy Jethro Gibbs as a new agent at the NCIS Camp Pendleton office. The show will chronicle Gibbs’ early career as he forges his own path on a team led by NCIS legend Mike Franks.
Mark Harmon will not appear in the series, but he will serve as its narrator as well as executive producer. His son, Sean Harmon, who has played Young Gibbs in NCIS flashbacks and came up with the idea for the prequel, will also serve as an EP alongside co-showrunners Gina Lucita Monreal and David J. North.
“We’re thrilled to be bringing this new chapter to life along with Mark and Sean Harmon,” Monreal and North said in a statement when the series was announced. “This really is the making of Leroy Jethro Gibbs. And even the most dedicated NCIS fans will discover that they don’t know the whole story.”
