Neil McCallum in UFO.
Neil McCallum (May 20th, 1929 – April 26th, 1976) was a British-Canadian actor and voice actor. He provided the voice of Dr. Ray Pierce in the film Thunderbirds Are Go (1966). His voice also appears in several episodes of later AP Films (now rebranded as Century 21) production Captain Scarlet and the Mysterons (1967). He made a live-action appearance in one episode of UFO (1970).
McCallum died on 26 April 1976 following a brain hemmorhage.