"Model Spy" is the 18th episode of Captain Scarlet and the Mysterons, a British Supermarionation television series created by Gerry and Sylvia Anderson and filmed by their production company Century 21 Productions. Written by Bill Hedley and directed by Ken Turner, it was first broadcast on 29 December 1967 on ATV Midlands. In "Model Spy", after the Mysterons threaten to assassinate a French intelligence agent, Captains Scarlet and Blue and Destiny and Symphony Angels go undercover to protect the target.