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Mark Harmon Made His TV Debut in a Kellogg's Cereal Commercial with His Father, NFL Player Tom Harmon
Related: Mark Harmon and NCIS: Origins Star Austin Stowell Go Inside the Prequel Series: 'We're a Family Already' (Exclusive) ...
A Long-Running NCIS Character Just Cameoed In The Origins Prequel, But I’m More Fascinated By What’s Coming Up For Gibbs And Lala
Warning: SPOILERS for the NCIS: Origins episode “Incognito” are ahead!