NCIS: Origins revealed two Gibbs rules you never heard - and they're big

"NCIS: Origins" Season 1, Episode 3, "Bend, Don't Break," opens with the younger Gibbs looking at scraps of paper that ...
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Mark Harmon to make rare 'NCIS: Origins' appearance and Gibbs is 'no longer alone'

"NCIS" legend Mark Harmon is bringing his OG Leroy Jethro Gibbs character to the prequel series "NCIS: Origins," and he's not coming alone. Harmon, 74, will make a rare guest appearance on "Origins" ...
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Mark Harmon Returning As Gibbs In NCIS: Origins' Crossover Event With NCIS — First Look

Daddy's home! Mark Harmon, who played Leroy Jethro Gibbs for 19 seasons on "NCIS," will reprise his role in an upcoming Season 2 episode of CBS' prequel series "NCIS: Origins," TVLine has learned.
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NCIS: Origins Bosses Explain Why We Didn't See Mark Harmon's Gibbs Reunite With Lala — Plus, Get Scoop On [Spoiler]'s Surprise Cameo

"NCIS: Origins" has welcomed Mark Harmon back into the NCIS-verse — but when will present-day Gibbs reveal more about his past with Lala? Tuesday's "NCIS" crossover event began with an hour of "NCIS: ...

‘NCIS: Origins’: Austin Stowell Talks ‘Incredible’ Crossover Transition From Mark Harmon’s Gibbs to His Version

NCIS: Origins ‘ opening scene of the crossover caught up with Gibbs in Alaska, where he had been joined by a dog, before what Austin Stowell, who stars as the character in the ’90s, calls an ...