Actors Brian Dietzen, David McCallum, Pauley Perrette, Mark Harmon, Sean Murray (backrow)Cote de Pablo and Michael Weatherly pose at CBS' 'NCIS' celebration of their 200th episode on January 3, 2012. (Mark Davis/Getty Images)
NEW YORK (AP) - Fans of "NCIS" can breathe easy. Mark Harmon will be sticking around, and his hit CBS drama is returning next season.
The network announced Harmon's one-year contract extension on Friday along with the renewal of a show that just keeps getting bigger.
Now in its 10th season, "NCIS" for the first time ranks as TV's most-watched program, CBS said, outpacing even NBC's "Sunday Night Football." ''NCIS" logs an average 21.5 million viewers each week, up 7 percent over last year.
Harmon stars as Special Agent Jethro Gibbs, who heads up a team that investigates crimes involving U.S. Navy and Marine Corps personnel. The cast also includes Michael Weatherly, Pauley Perrette, Rocky Carroll and David McCallum.
"NCIS" premiered in Fall 2003.