Peter Dyneley (13 April 1921 – 19 August 1977) was an English actor. Although he appeared in many smaller roles 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. Uncredited, Dyneley also provided the voice of the countdown that introduces the Thunderbirds title sequence. (Via Wikipedia)