(written from a Production point of view)
Billy Curtis (27 June 1909 – 9 November 1988; age 79) was the actor who played a small copper-skinned ambassador in the Star Trek: The Original Series second season episode "Journey to Babel", for which he went uncredited. He filmed his scene on Monday 25 September 1967 at Desilu Stage 9.
Curtis' film career started in 1938 with the starring role in the film The Terror of Tiny Town. A year later he had a role in the classic movie The Wizard of Oz. Curtis went on to appear in over eighty movie and television roles. In 1951, he played an uncredited "Mole-Man" in the film Superman and the Mole-Men, which featured Jeff Corey. Seven years later he starred (wearing a dog costume) in the failed television pilot The Adventures of Superpup. In 1952, he appeared in a small role in Charles Chaplin's Limelight, which also featured Morgan Farley. In 1966, he appeared in two episodes of Batman, playing one of the henchmen of False Face, portrayed by Malachi Throne. In 1968, Curtis portrayed a child ape in the science fiction classic Planet of the Apes, which role also went uncredited. The film featured James Daly, Lou Wagner, Paul Lambert, Jane Ross, Felix Silla, music by Jerry Goldsmith and designs by Wah Chang. He also played a small role as a circus midget in another classic science fiction film, The Incredible Shrinking Man (1957), written by Richard Matheson (based on his own novel) and featuring William Schallert. He also appeared in a 1981 episode of Buck Rogers in the 25th Century with Felix Silla, and directed by Vincent McEveety. Apart from science fiction, Curtis' most famous film is Clint Eastwood's 1973 western High Plains Drifter, in which his co-stars included Marianna Hill and William O'Connell.