“NCIS”
Michael Weatherly stuck around for 13 seasons before finally calling it quits on “NCIS.” The actor cited wanting to explore new ventures as his reason for quitting, which is understandable, seeing as he’d played the same character for over a decade. We guess he didn’t want to venture too far, though, because he went on to immediately star in another CBS show, which we’re sure he’ll get locked into well into retirement age.