Austin Stowell exclusively told Us Weekly about Mark Harmon's immediate response to his 'NCIS: Origins' performance as Gibbs ...

There was a time when it seemed impossible for NCIS to keep going without Mark Harmon leading the charge as Leroy Jethro ...

Austin Stowell is well-aware that he has big shoes to fill as he takes on the role of young Leroy Jethro Gibbs on NCIS: ...

Mark Harmon has come a very long way from his very first acting jobs. The former NCIS star has been in the business since the early 1970s, and aside from his role as Special Agent Leroy Jethro ...

“I think they have laws against that now,” Consuelos added, and Harmon retorted, “Not then!” Related: Mark Harmon and NCIS: ...

Mark Harmon may not have much of an acting role in NCIS: ORIGINS, but he is still very much involved.

Except, of course, he did help cast it. Related: Mark Harmon on Why Austin Stowell Is the Perfect Young Leroy Jethro Gibbs for NCIS: Origins “We're happy with the cast,” Harmon says.

Could you imagine someone other than Mark Harmon playing Leroy Jethro Gibbs on the NCIS cast? No, we aren’t talking about the Young Gibbs we have seen in flashbacks ...

Rodriguez/Getty Mark Harmon wasn't originally too fond ... football and broadcasting icon Tom Harmon. The NCIS star explained that his father was a Kellogg’s spokesperson and he was asked ...