entirely pleased with Nation's script for the serial. Throughout production, Martin realised that Hartnell struggled to learn his lines, and was supported largely by Russell and Hill. Martin recalled head of Drama and Doctor Who co-creator Sydney Newman praising his and Hartnell's work on the serial at a bar after recording; Hartnell consistently wanted to rerecord to perfect his performance. Edmund Warwick, who portrayed the robotic version of the Doctor, said that his scenes were a "thank you" written in for him; the previous year, he had replaced Hartnell at short notice after he was injured during the recording of The Dalek Invasion of Earth. During rehearsals for the fourth episode, Hartnell demonstrated his mannerisms for Warwick to imitate. Warwick shaved his moustache for the role. He mimed the scenes to dialogue that was pre-recorded by Hartnell on 27 May 1965. Due to the complexity of the scene, Warwick portrayed the real Doctor with his back to the camera in some shots. For the Mechonoids, Martin hired actors who had previously portrayed Daleks and Zarbi; Robert Jewell and Kevin Manser had recently completed work on Dr. Who and the Daleks (1965). David Graham pre-recorded most of his Dalek voices: for the sixth episode on 20 April at Maida Vale Studios, for the first two episodes on 21 April at Lime Grove Studios alongside Peter Hawkins, and for the third and fourth episodes on 12 and 19 May at Lime Grove. Martin cast several actors he had previously worked with in theatre. Arne Gordon, who played the tour guide in the third episode, required special dispensation from the Ministry of Labour and National Service to appear in the show. Roslyn de Winter was cast as the Grey Lady; she was previously hired to play Vrestin and choreograph the Menoptra in The Web Planet. Martin retrospectively found the costumes of the Aridians—played by Ian Thompson and Hywel Bennett—to be "awful" due to the constrained budget; their movement was ballet-like due to the creatures' piscine nature, but Martin felt that they could have taken it further to appear more extraterrestrial. The characters of Frankenstein's monster and Dracula were closely modelled on their appearances in the 1931 films Frankenstein and Dracula, respectively; the script referred to Frankenstein's monster being dressed in "the traditional Karloff costume", referring to Boris Karloff who portrayed the monster in the film. Playing Dracula, Malcolm Rogers pre-recorded his speech and