Mark Harmon did not return to NCIS Season 22 as Leroy Jethro Gibbs. While the character was referenced in the episode “Irreconcilable Differences,” Harmon himself did not make an on-screen appearance. Instead, the episode featured a dream sequence involving Gibbs, but this was not a new performance by Harmon. Fans hoping for a live-action return of Gibbs in Season 22 were left disappointed .