How Did Mark Harmon Return for the 'NCIS' Spin-off 'Origins'? - Collider

NCIS Fans Should Watch Mark Harmon In The West Wing Season 3 - Game Rant

Long Before 'NCIS,' Mark Harmon Took a Swing — and Missed — in This Forgotten Comedy - Collider

Did Mark Harmon Come Back To NCIS Season 22? Gibbs's Recent Return, Explained - Game Rant

Mark Harmon reveals how he's able to sustain stardom in Hollywood - The News International

Mark Harmon's Big NCIS: Origins' Lala Confession Is Insulting To Gibbs' Arc In The Flagship - Screen Rant

Will Mark Harmon Return for NCIS: ORIGINS Season 2? - Movieguide

'I Prefer Parker To Gibbs' Fans Continue To Debate The Best NCIS Main Character Years After Mark Harmon's Exit (& I'm Torn) - Game Rant

‘NCIS: Origins’ Season 2: Will Mark Harmon Appear Onscreen Again? - IMDb

‘NCIS: Origins’ Season 2: Will Mark Harmon Appear Onscreen Again? - TV Insider

Obituary for Hal Russell Harmon, Sr. - Mark A. Schneider-Gompf Funeral Home

Mark Harmon's 10 Best Movies And TV Shows - Screen Rant

Mark Harmon Starred in 'Worth Winning' Before 'NCIS' - MSN

Tim Benz on Harmon | 105.9 The X | Mark Madden - 105.9 The X

Mark Harmon Reveals That NCIS Could’ve Been Much Different - Movieguide