Mark Harmon REACTS to First Interview as He Makes MAJOR NCIS Return | ET Then & Now

Description: Mark Harmon opens up to ET about returning to TV as Leroy Jethro Gibbs in Season 3 of 'NCIS: Origins,' five years after leaving 'NCIS.' In this ET Then & Now, the actor looks back at his decades-long career, from his first ET interview on 'Flamingo R ... Read more