Mark Harmon Is Back as Gibbs for All of NCIS: Origins Season 3

Mark Harmon's return as Leroy Jethro Gibbs is much bigger than another cameo. The NCIS veteran will appear throughout every episode of NCIS: Origins Season 3 as the series expands the story into Gibbs' present-day life in Alaska.

A mystery connected to his past at Camp Pendleton follows Gibbs north and threatens the peaceful retirement he's built for himself. And this time, it could be enough to pull the legendary NCIS agent back into action.

NCIS: Origins returns October 6 at 10/9c on CBS and streams on Paramount+.