The Impostors

"The Impostors" is an episode of Thunderbirds, a British Supermarionation television series created by Gerry and Sylvia Anderson and filmed by their production company AP Films (later Century 21 Productions) for ITC Entertainment. Written by Dennis Spooner and directed by Desmond Saunders, it was first broadcast on 13 January 1966 on ATV Midlands as the 16th episode of Series One. In the official running order, it is the 19th episode.