Thunderbirds Are Go is a 1966 British science-fiction film based on Thunderbirds, a 1960s television series starring marionette puppets and featuring scale model effects in a filming process dubbed "Supermarionation". Written by Thunderbirds creators Gerry and Sylvia Anderson, directed by David Lane and produced by AP Films, Thunderbirds Are Go develops the franchise with a plot focusing on the futuristic spacecraft Zero-X and its manned mission to Mars. When Zero-X suffers a mechanical failure during re-entry, it is up to International Rescue, with the aid of the Thunderbird machines, to save the astronauts on board before the spacecraft is obliterated in a crash landing.