Filmed in Supermarionation (2014)

A documentary about the people and processes through which a team of talented creators and puppeteers created the puppetry style that became known as Supermarionation. (Nothing to do with an Italian plumber, it's a portmanteau of the words super, marionette and animation.)
Most famous for the Thunderbirds TV series (1965-66), the team's story begins in 1957, making television commercials. Directed by Stephen la Riviere (but presented by Parker and Lady Penelope) it's a fascinating look into the undertaking and an enlightening journey into the minds of its most well-known members, including interviews with Gerry and Sylvia Anderson.
It's a standard talking heads doc, but is made with genuine love for the medium, and as such is a must-watch for any fan of the genre.

3½ strings attached out of 5