NCIS: Origins star Austin Stowell nearly passed on playing the young Leroy Jethro Gibbs. In 2024, three years after Mark Harmon made his final appearance as Gibbs on NCIS, Stowell debuted as the younger take on the character on NCIS: Origins. NCIS: Origins season 2 concluded on May 6, while season 3 had already been renewed in January. However, Origins season 3 will only comprise 10 episodes, with NCIS: Sydney season 4 taking over its new timeslot during the 2027-2028 midseason period. NCIS: Origins season 3 premieres Tuesday, October 6 at 10 p.m.