Mark Harmon and Austin Stowell on playing Leroy Jethro Gibbs in "NCIS" | Between Us

Mark Harmon, who played Leroy Jethro Gibbs for 18 seasons on "NCIS," sits down with Austin Stowell, who plays the younger version of Gibbs on "NCIS: Origins," to talk about playing the iconic character, reflect on the start of their acting careers and what's in store for Season 3 of the prequel series.

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