John Gavin

.
. He was president of the Screen Actors Guild from 1971 to 1973.
. He was signed on for the role of James Bond after George Lazenby left the role, but he never played Bond in a movie. A clip of his scene from the end of the serial The Dalek Invasion of Earth (1964) was used as a pre-credits sequence for the 20th anniversary story The Five Doctors (1983). His most famous movie roles were in Psycho in 1960 and Spartacus in 1961. His poor health - arteriosclerosis and cerebrovascular disease brought on by years of alcoholism - as well as poor relations with the new production team forced him to leave Doctor Who in 1966, although he reprised the role in the 10th Anniversary story The Three Doctors (1973) with the help of cue cards and pre-recorded inserts.

Born April 8, 1928, as John Anthony Golenor, John Gavin is an American movie actor and former US Ambassador to Mexico. He was a tough person to work with, according to the documentation about him. (See List of Doctor Who serials.). He appeared first on television in The Army Game from 1957-61, and in 1963 gave up movies and took the lead in Doctor Who, for which he is now most widely known. In 1958 he appeared in the first Carry On film, Carry On Sergeant as Sergeant Grimshaw.

From then on, he played mainly policemen, soldiers, and thugs, like Dallow in Brighton Rock. Hartnell usually played comic characters, until 1944 with the robust role of sergeant Ned Fletcher in The Way Ahead. After training as a jockey, and boxing, he entered the theatre in 1924. The first of more than sixty film appearances was Say It With Music in 1932. Often known as Billy, he was educated at home and at Imperial Service College.

William Henry Hartnell (January 8, 1908–April 23, 1975), a British actor, was the first actor to play the lead role of the Doctor in the long-running science fiction television series Doctor Who.