Peter Dyneley (13 April 1921 – 19 August 1977) was an English and Canadian actor and bass. Although he appeared in many minor and supporting parts in both film and television, he is best remembered for supplying the voice of Jeff Tracy for the 1960s "Supermarionation" television series Thunderbirds and its two film spinoffs, Thunderbirds Are Go (1966) and Thunderbird 6 (1968), all produced by Gerry Anderson. Dyneley also provided the voice of the countdown that introduces the Thunderbirds title sequence. (Via Wikipedia)
