From Wikipedia, the free encyclopedia. Peter Dyneley (13 April 1921 - 19 August 1977) was a British actor, born in Hastings, East Sussex, England. Although appearing in many smaller roles in both film and television, he is best remembered for his performance as the voice of Jeff Tracy in the Gerry Anderson 1960s TV series Thunderbirds and the subsequent movies Thunderbirds Are GO (1966) and Thunderbird 6 (1968). Dyneley also provided the uncredited voice-over countdown in the opening sequence ...