Thunderbirds Are Go is a 1966 British science-fiction puppet film based on Thunderbirds, a Supermarionation television series created by Gerry and Sylvia Anderson and produced by their company Century 21 Productions. Written by the Andersons and directed by David Lane, Thunderbirds Are Go concerns spacecraft Zero-X and its human mission to Mars. When Zero-X suffers a malfunction during re-entry, it is up to life-saving organisation International Rescue, supported by its technologically-advanced Thunderbird machines, to activate the trapped crew's escape pod before the spacecraft hits the ground.