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Mark and Sean Harmon on What to Expect From the 'NCIS: Origins' Prequel (Exclusive)

The prequel will tell the story of how LeRoy Jethro Gibbs became an NCIS agent in 1991.

And while speaking to ET's Kevin Frazier on Thursday at the CBS Schedule Reveal Celebration at the Paramount Studios Lot in Los Angeles, California, the Harmons made it clear that they are laser-focused on how exactly they want to travel down memory lane. - GettyThe prequel will star Austin Stowell as Special Agent Gibbs, and the series will chronicle his start at the famed law enforcement agency. The series will also star Mariel Molino as Special Agent Lala Dominguez, Kyle Schmid as the formidable Mike Franks, and Tyla Abercrombie as Field Operations Support Officer Mary Jo Sullivan.

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