Short for "Space Intruder Detector", SID is a satellite in Earth orbit which detects and tracks UFOs. It provides the first warning of a UFO approaching from deep space, and can also track UFO's flying in the Earth's atmosphere. It provides targeting coordinates for the Moonbase Interceptors and Sky fighters, and communicates with Moonbase and SHADO HQ using a monotone voice.

Voice of SID: Mel Oxley

Episodes: All except Survival, Conflict, Court Martial, Confetti Check A-OK, The Psychobombs, Timelash, Mindbender, The Long Sleep

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