Roger Ewing - "Thad Greenwood" At 22, Roger Ewing joined 'Gunsmoke' as a guest star, later becoming a series lead for two years. Despite leaving the show, it continued for another eight years.

The show often explored themes like loyalty, grief, vengeance, and redemption. Even after 20 seasons, its legacy endures, and at the heart of Gunsmoke’s success was its unforgettable cast.