(written from a Production point of view)
Glenn Corbett (born Glenn Rothenburg) (17 August 1933 – 16 January 1993; age 59) was a California-born actor whose early career was largely in television; he made many guest appearances in television shows throughout the '60s, '70s, and early '80s, including his role as Zefram Cochrane in the original Star Trek episode "Metamorphosis". He filmed his scenes on Thursday 11 May 1967 and between Monday 15 May 1967 and Friday 19 May 1967 at Desilu Stage 10.
He is perhaps best remembered for his regular role as Linc Case in the final season (1963-64) of Route 66, where his portrayal of a returned soldier from Vietnam constituted one of the earliest acknowledgements of that war on dramatic television. He worked with future "Metamorphosis" director Ralph Senensky in an episode of the series. Previously, he had been a regular in the critically-acclaimed but short-lived dramatic series It's A Man's World. In 1967, Corbett starred in Irwin Allen's unsold pilot City Beneath the Sea (also featuring Lawrence Montaigne), which was originally proposed by Allen to NBC as a potential replacement for Star Trek, had it been cancelled. The same year, Corbett guest starred in "The Weird World", an episode of Allen's series Land of the Giants, which featured Don Marshall in the cast.
In the '70s and '80s, his movie career included a number of lead roles in films such as The Stranger (1973, with Sharon Acker and Tim O'Connor). In the early '80s, he was cast in two popular soaps: The Doctors and Dallas (where he played Donna Culver Krebbs' (Susan Howard) lawyer and friend, Paul Morgan). He appeared in two episodes of lawyer/crime series Petrocelli, also starring Susan Howard. One of these, "Edge of Evil" guest starred William Shatner and Susan Oliver. (This marked Corbett's third TV appearance with Shatner, with the two men having previously guested on each other's series.) The other one, "Five Yards of Trouble" was directed by Joseph Pevney and featured Barbara Luna. He also guest starred in two episodes of Barnaby Jones, starring Lee Meriwether: "Divorce - Murderer's Style", directed by Lawrence Dobkin and featuring Liam Sullivan and "Master of Deception", featuring Kenneth Tobey. Lung cancer claimed his life in 1993, three years before James Cromwell would take over his role as Cochrane in Star Trek: First Contact.