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Mark headed up the show for 18 years as Special Agent Gibbs Harriet Margulies worked on the show for almost two decades His future on the show has been brought into question... A scheduling shake-up saw reruns air on Monday night instead Are you a fan of the spinoff series? Is this the last we've seen of Gibbs? Could episode four of season 19 be Mark Harmon's last appearance on the drama? Viewers weren't expecting this... The hugely popular drama returns to screens on Monday 20 September Multiple endings were filmed it has been revealed The new series hits screens next month Seasons one to 15 were previously available on the streaming site The actress has officially retired from acting Season 19 will premiere on Monday 20 September We can't wait for this to hit screens! Returning and exiting stars, airdate, plot and more The actor first appeared on screens nearly 50 years ago Gary Cole is reportedly being lined up for a season 19 role The Ellie Bishop actress has hung up her gear for good Looking for something to binge now NCIS is over for another season? We've got you covered The long-running series will look different when it returns She makes her debut in Tuesday night's episode The two agents came close to admitting their feelings for each other in the latest episode Wilmer Valderrama has revealed what fans can expect Gibbs will be back, but perhaps not in the same way It's a historic move for the long-running franchise Could this be how Mark Harmon leaves the show? Could this be how Gibbs leaves the show? The actor who plays Gibbs has led the series since 2003 Season 18 of the show is proving to be a real tear jerker The actor's real name is James Todd Smith The show recently returned for its 18th series See the most adorable snaps of their families here Warning! Spoilers ahead for NCIS season 18 Many famous faces have appeared in the show over the years The two went their separate ways in 2016 The show recently returned for its 18th season