Supermarionation a puppet hand, suspended by wires, operating the controls of "Thunderbird 1". The term "Supermarionation" was not coined until during production of later episodes of "Supercar". As a result, "Four Feather Falls" is often omitted from lists of Supermarionation productions. Two feature films based upon "Thunderbirds" were also made with Supermarionation: "Thunderbirds Are Go" (1966) and "Thunderbird 6" (1968). Numerous episodes of "Thunderbirds", "Captain Scarlet", and other series were also edited together (sometimes with the addition of new narration) to form movie-length features for VHS release and TV syndication in the 1980s. "The Secret Service" was actually a hybrid of
Supermarionation of the puppets ... to give their 'acting' the integrity to match the material." David Garland, author of the essay "Pulling the Strings: Gerry Anderson's Walk from 'Supermarionation' to 'Hypermarionation'" (2009), calls character movement Anderson's "" and comments that the puppets' limited mobility resulted in "vehicle-heavy science fiction [becoming] Anderson's preferred genre". He considers the use of marionettes – "the type of puppet perhaps most unsuited" to an action format, to be "one of the most striking paradoxes" of the Anderson puppet series. In many cases, the puppets were modelled on their voice actors. Two examples are Lady Penelope in