Thread:Hiromichi/@comment-5802826-20150119135131/@comment-1471931-20150119161343

To defend against the aliens, a secret organisation called SHADO, the Supreme Headquarters, Alien Defence Organisation, is established. Operating under the cover (as well as under the premises) of the Harlington-Straker Studios movie studio in England, SHADO is headed by Commander Edward Straker (Ed Bishop), a former United States Air Force colonel and astronaut, who poses as the studio's chief executive.

Establishing the main character as a studio executive was a cost-saving move by the producers: the studio was the actual studio where the series was being filmed, originally the MGM-British Studios and later Pinewood Studios – although the Harlington-Straker studio office block seen throughout the series was actually Neptune House, a building at the former British National Studios in Borehamwood that was owned by ATV. Pinewood's studio buildings and streetscapes were used extensively in later episodes, particularly "Timelash" and "Mindbender", the latter featuring scenes that showed the behind-the-scenes workings of the UFO sets when Straker briefly finds himself hallucinating that he is an actor on a TV series and all his SHADO colleagues are likewise actors.

Typical of Anderson productions, the studio-as-cover idea was both practical and cost-effective for the production and provided a ready-made vehicle for the viewer's suspension of disbelief. It removed the need to build an expensive exterior set for the SHADO base and combined the all-important "secret" cover (concealment and secrecy are always central themes in Anderson dramas) with the trademark ring of at least nominal plausibility. A studio was a business where unusual events and routines would not be remarkable or even noticed. Comings and goings at odd times, the movement of vehicles, equipment, people and material would not create undue interest and could easily be explained away as "sets", "props", or "extras".

Another Anderson leitmotif was the concept of the mechanical conveyor, e.g. the automatic boarding tubes of the Stingray and the Thunderbird craft. In UFO, this appeared in the guise of Straker's "secret" office, which doubled as a lift (elevator) that takes him down to the SHADO control centre located beneath the studio. The pilots of the space interceptors and the submersible "Sky One" jet interceptor slide down boarding chutes into their craft. The interceptors then rise from their hangar via elevating platforms to a launch pad disguised as a lunar crater. This was a carry-over from the earlier marionette series where it was used due to the difficulty in getting puppets to walk and get them into cockpits.

SHADO has a variety of high-tech hardware and vehicles at its disposal to implement a layered defence of Earth. Early warnings of alien attack would come from SID, the Space Intruder Detector, a computerised tracking satellite that constantly scans for UFO incursions. The forward line of defence is Moonbase from which the three Lunar Interceptor spacecraft, carrying nuclear missiles, are launched. The second line of defence includes Skydiver, a submarine mated with the submersible, undersea-launched Sky One interceptor aircraft, which attacks UFOs in Earth's atmosphere. The last line of defence are ground units including the armed, IFV-like SHADO Mobiles, fitted with caterpillar tracks. Special effects, as in all Anderson's marionette shows, were supervised by Derek Meddings, while the vehicles were designed by Meddings and his assistant, Michael Trim.