His other notable television roles in the early-to late-1960s were as Wes Macauley on It's a Man's World (1962-1963) and an episode of Gunsmoke in which a man gets a reputation as a gunman when he's found with four dead outlaws at his feet. He is probably best remembered by science fiction fans for his guest starring role in the second season Star Trek episode Metamorphosis (1967) as Zefram Cochrane, the inventor of warp drive. He returned to movies in the 1970s, and starred with John Wayne in the films Chisum (1970), and Big Jake (1971). Later in the 1970s he had the lead role in Nashville Girl (1976) and in Universal's war epic Midway (1976). In 1977, he joined the cast of the NBC daytime soap opera, The Doctors, and stayed with the show until 1981 when he was cast in the long-running television series Dallas. After his character was written off the show in 1988, he stayed with the Lorimar Television production company for three more years as its dialogue director. In January 1993, Glenn Corbett died of lung cancer at the Veterans Affairs hospital in San Antonio, Texas, at the age of 59 and was buried in the veterans' cemetery there.
Fort Sam Houston National Cemetery