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30 years before Gibbs, Mark Harmon played an officer in failed 'Emergency!' spinoff

Actor Mark Harmon has had one of the most prolific careers in Hollywood, remaining a familiar face on both the big and small ...
UPI

Mark Harmon to guest star on 'NCIS: Origins'

Oct. 28 (UPI) --NCIS legend Mark Harmon is to guest star as his character, Leroy Jethro Gibbs, on the prequel, NCIS: Origins, next month. Harmon is heard narrating the 1990s spin-off, which is now in ...