The series was shot on 405-line videotape using a multicamera setup. There was little provision for editing and virtually no location footage was shot (although the first shot of the first episode consisted of location footage). As was standard practice at the time, videotapes of early episodes of "The Avengers" were reused. At present, only three complete Series 1 episodes are known to exist and are held in archives as 16-mm film telerecordings: "Girl on the Trapeze" (which does not feature Steed), "The Frighteners" and "Tunnel of Fear". Additionally, the first 15 minutes of the first episode, "Hot Snow", also exist as a telerecording; the extant footage ends at the conclusion of the first act, prior to the introduction of John Steed.