Filmed in Supermarionation - billed as "the definitive documentary about the unique puppetry and animation technique developed by Gerry and Sylvia and their team and utilised in all their programmes throughout the 1960s" - has been directed and co-produced by Stephen La Riviere from his book of the same name.
It is hosted by Thunderbirds characters Lady Penelope and Parker, and features previously unseen archive footage, new interviews with surviving cast and crew, and clips from the shows. In addition, pioneering techniques used in the productions have been accurately re-created for the film, which will be premièred at the BFI later this year ahead of a general release.
Before then, though, a preview of selected scenes together with a question-and-answer session with the film's creative team will be held at Andercon on Saturday 19th April.
In the meantime, Network, which specialises in classic British TV programmes, has released two clips from it: