Stephen Paul La Rivière (born 16 November 1984) is a British producer, director, writer, and editor. He worked on Filmed in Supermarionation (a documentary based on his book of the same name) in all four of the aforementioned capacities. Additionally, La Rivière spearheaded the Thunderbirds 1965 project and directed the first episode. He has an account on the eagletransporter.com forum under the username 'Masterspy'.