The Impostors

Disguised as International Rescue operatives, a pair of crooks make off with the top secret plans of the AL4 space interceptor missile during a bogus rescue mission near the Aeronautical Centre. When the robbery is discovered, General Lambert launches a worldwide search to track down International Rescue and bring them to justice!

Jeff Tracy, Jeremiah Tuttle, Air Force Officer, Air Force Lieutenant, Lady Penelope Creighton-Ward, Ma Tuttle, Fireflash Stewardess, Scott Tracy, Virgil Tracy, Alan Tracy, Eddie Kerr, Wakefield, Speed Merchant, Gordon Tracy, Aloysius Parker, Elliott, Carela, Captain Hanson (featured in "Trapped in the Sky"), Helijet Pilot, Search Control, Jack, John Tracy, General Lambert, Jenkins, Hale, Fireflash Co-Pilot (featured in "Trapped in the Sky"), Colonel, Tin-Tin Kyrano

Thunderbirds was the most expensive Supermarionation series up to that time. Although it had resemblances to the live-action CBS series Mission: Impossible, it actually premiered on British TV a year before Mission: Impossible was first seen in the U.S.

Gerry Anderson repeated the characters and plotlines for "Thunderbirds 2086," an animated series which ran on U.S. cable TV in 1984, then entered syndication a year later.