(written from a Production point of view)
Leonard Mudie (11 April 1883 – 14 April 1965; age 82) was an English actor who appeared as the second illusory survivor of the SS Columbia in "The Cage", the original unaired pilot for Star Trek: The Original Series, a role which ultimately proved to be his last. Footage including his scenes was later incorporated into the episode "The Menagerie, Part I".
In his career, extending nearly 45 years, Mudie appeared in over 130 feature film, some of the more notable being such classics as 1932's The Mummy, 1935's Captain Blood and Les Miserables, 1937's Lost Horizon (starring Jane Wyatt), 1938's The Adventures of Robin Hood, 1939's Dark Victory, 1940's Foreign Correspondent (with Ian Wolfe) and The Letter, 1942's Random Harvest (also with Ian Wolfe), the 1951 science fiction classic When Worlds Collide (starring Richard Derr and John Hoyt), 1952's Limelight, and 1955's Kiss Me Deadly, which was based on a novel that was coincidentally referenced in Star Trek: Kiss Me Deadly, and on which Robert Justman worked as assistant director.
Mudie has also appeared in multiple episodes of Adventures of Superman. Other television programs he has appeared in include Sea Hunt and The Untouchables, another coincidental Star Trek reference.
Along with Judith Anderson, Morgan Farley, Richard Hale, Anthony Jochim, Felix Locher, Celia Lovsky, Charles Seel, Abraham Sofaer, John Warburton, and Ian Wolfe, he is one of only eleven credited Star Trek guest stars born in the 19th century to appear in any episode or film. At 81, he was one of the oldest actors to appear on TOS, second only to Felix Locher. He died just five months after filming "The Cage" and one year and five months before The Original Series first aired. Mudie was the first Star Trek actor to die.