and the agreement in effect amounted to little more than a pre-production purchase pact. Nathan-Turner's first choice of director for the story was Waris Hussein, who had directed the first-ever Doctor Who serial, An Unearthly Child, in 1963. However, Hussein was in America at the time and was unable to accept the offer. Nathan-Turner then asked another veteran director, Douglas Camfield, to direct but he also declined. Camfield was also very ill with heart disease, and this may have affected his decision not to direct the production. He died of a heart attack early in 1984. The original script featured an appearance by the Autons, last seen in Terror of the Autons (1971). After being dropped into the Death Zone, Sarah would have been attacked by a group of them before being rescued by the Third Doctor. However, due to budgetary restrictions, the scene was dropped and replaced in the finished version. Just before she meets the Third Doctor, Sarah falls a few feet down what fans have generally considered a rather unconvincing slope. In the novelisation, Sarah actually steps off a cliff. This was what was originally intended in the script, but for budgetary reasons the sequence was changed. Location filming took place at Cwm Bychan, Llanbedr. The Yeti costume used in the serial was last used in The Web of Fear in 1968. It had decayed badly in 15 years of storage, requiring dim lighting and selective camera angles during filming. The story was prepared in two formats: the ninety-minute version and a four-part version, the latter designed for international distribution or repeat broadcasting in the ordinary series run. The episode breaks were, respectively, Sarah falling down the slope, the Cybermen placing their bomb outside the TARDIS while Susan and Turlough watch, and the Master appearing behind the First Doctor and Tegan while in the Dark Tower. This is the only programme from the classic series of Doctor Who for which all recorded and filmed material, including alternate and unused takes, fluffed scenes and so forth, still exists in broadcast-quality format. This allowed for the creation of the 1995 version of the story. The Five Doctors was recorded in four-channel stereo, but broadcast in mono. The later DVD releases had a Dolby Digital 5.1 soundtrack. In the various publicity photos of the five Doctors from this story, a waxwork model of Tom Baker from a 1980 Doctor Who