Harmon is serving as executive producer and narrator on 'NCIS: Origins,' but when it came to casting his character's younger self, the actor only had two words to say to actor Austin Stowell.

NCISstar Mark Harmon first gained a measure of television stardom on the acclaimed NBC medical drama series St. Elsewhere in the role of Dr. Robert “Bobby” Caldwell, a handsome, womanizing ...

Mark Harmon’s narration helps Austin Stowell’s performance in ‘NCIS: Origins’ NCIS found a loophole that would have Harmon ...

NCIS: Origins star Austin Stowell confessed how he really feels about stepping into Mark Harmon's shoes as the young version ...

Mark Harmon's colourful life and career explored. From his defining role as Leroy Jethro Gibbs in NCIS to his sweet love story with Pam Dawber, and incredible act of heroism, here's what you need ...

Kyle Schmid, Mark Harmons Alberto E. Rodriguez/Getty Images(2). Kyle Schmid has fully embraced his role as “hippie cowboy” Mike Franks on NCIS: Origins, thanks to advice from both Mark Harmon ...

Ever since Mark Harmon's beloved NCIS character Leroy Jethro Gibbs said goodbye to his team and hello to Alaska in season 19, episode 4, "The Great Wide Open," fans have missed his signature charm.

Mark Harmon is getting a brief stint on NCIS: Origins and the royal treatment from bosses, which has stars from the original series steamed and blasting the T.V. veteran for stealing their thunder.