Mark Harmon once discussed the likelihood of appearing in a hypothetical series finale for the long-running ‘NCIS’.

While it was previously announced that Harmon would return as older Gibbs to narrate the series, NCIS: Origins co-showrunner ...

Mark Harmon, who played the 'NCIS' lead Leroy Jethro Gibbs for 18 years, is returning for an appearance on ‘NCIS: Origins’ ...

NCIS: Origins isn't just exploring Gibbs when he was younger - the prequel also features Mark Harmon reprising his role as ...

NCIS: Origins has been confirmed to feature an appearance from Mark Harmon as Leroy Jethro Gibbs, with fans set to see the ...