"Flight 104" is the 26th 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 Tony Barwick and directed by Robert Lynn, it was first broadcast on 1 March 1968 on ATV Midlands. Set in 2068, the series depicts a "war of nerves" between Earth and the Mysterons: a race of Martians with the power to create functioning copies of destroyed people or objects and use them to carry out acts of aggression against humanity. Earth is defended by a military organisation called Spectrum, whose top agent, Captain Scarlet, was killed by the Mysterons and replaced by a reconstruction that subsequently broke free of their control. Scarlet's double has a self-healing power that enables him to recover from injuries that would be fatal to anyone else, making him Spectrum's best asset in its fight against the Mysterons. In "Flight 104", the Mysterons take control of an airliner that is flying Scarlet, Captain Blue and an astrophysicist to a secret conference that has been called to discuss a proposed return mission to the Mysterons' planet, Mars. Plot A top-secret conference is to be held at Lake Toma, Switzerland to discuss a proposed return to the Mysterons' planet, Mars. One of the conference delegates, astrophysicist Dr Conrad, will be flying to Geneva Airport accompanied by two bodyguards: Spectrum Captains Scarlet and Blue (voiced by Francis Matthews and Ed Bishop). The Mysterons (voiced by Donald Gray) have threatened to sabotage the conference. During a pre-flight stay at the Adelphi Hotel, Scarlet and Blue encounter two journalists, Harry and Joe, whose editor is desperate for news stories. Recognising Conrad and sensing a scoop, Harry and Joe follow the Spectrum party to Novena Airport and try to book seats on Flight 104, which will be carrying Conrad, Scarlet and Blue to Geneva. Spectrum has anonymously booked all of the seats to ensure that the trio will be travelling alone. However, Scarlet and Blue ask the airport authorities to admit the journalists to prevent Conrad's movements from being published. Shortly after Flight 104 takes off, its crew are found unconscious in a storage room. It is discovered that they were drugged by Captain Black and that the airliner is under Mysteron control. On Cloudbase, Colonel White (voiced by Donald Gray) orders the launch of the Angel squadron,