Mark Harmon
Mark Harmon returns as Gibbs in NCIS crossover event
Mark Harmon will reprise his role as Leroy Jethro Gibbs in an upcoming crossover between NCIS and NCIS: Origins, airing on November 11. The event features a time swap where the prequel airs first, followed by the original series. Harmon's return addresses fan curiosity about Gibbs' life after his disappearance to Alaska.