Plot: The Secret Service is a British children's espionage television series, made by Century 21 for ITC Entertainment and broadcast on Associated Television, Granada Television & Southern Television in 1969. Created by Gerry and Sylvia Anderson, and produced by David Lane and Reg Hill, it was the eighth and last Century 21 production to feature – in a manner similar to Thunderbirds and other earlier series – marionette puppet characters as part of a filming technique known as "Supermarionation"