"The Perils of Penelope" is an episode of Thunderbirds, a British Supermarionation television series created by Gerry and Sylvia Anderson and filmed by their production company AP Films (APF, later Century 21 Productions) for ITC Entertainment. Directed by Alan Pattillo and Desmond Saunders from a script by Pattillo, it was first broadcast on 14 October 1965 on ATV Midlands as the third episode of Series One. It is the 12th episode in the official running order.