Lady Penelope Creighton-Ward (born 24th December 2000) is a fictional character introduced in the British 1960s Supermarionation television series Thunderbirds, which was produced by AP Films (APF) for ITC Entertainment. The character also appears in the film sequels Thunderbirds Are Go (1966) and Thunderbird 6 (1968), the 2004 live-action film Thunderbirds and the CGI remake series Thunderbirds Are Go. In the world of Thunderbirds, Penelope is employed by the secret organisation International Rescue as its London field agent. She was voiced by Sylvia Anderson in the original 32 episodes, 2 films and 3 anniversary episodes and by Genevieve Gaunt in the 2021 revival which is a continuation of the original series.