The accuracy of Rigelsford's reference work has been disputed, for example for unsourced and previously unheard-of quotes from William Hartnell and Roger Delgado, or the omission of the entirety of Season 18 from one of his Doctor Who reference works.
Kismet Delgado, the widow of Roger Delgado, who had played the Master during the Third Doctor's era, was one of the voices for the Spiders.
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Due to the death of actor Roger Delgado, script editor Terrance Dicks abandoned the project in favour of a new story, which eventually evolved into Planet of the Spiders.
He was married to actress Catherine Schell from 1968–1977 and Kismet Delgado, the widow of actor Roger Delgado from 1979-2003.
Roger Moore | Roger Corman | Roger Federer | Roger Daltrey | Who Framed Roger Rabbit | Roger Waters | Roger Maris | Roger McGuinn | Beaumont-le-Roger | Roger Zelazny | Roger Ebert | Roger Clemens | Roger Smith | Roger Miller | Roger Tory Peterson | Roger Vadim | Roger Sanchez | Roger Blench | Roger Williams | Roger & Me | Roger Taylor | Roger Staubach | Roger Heim | Roger Goodell | Roger Douglas | Roger Williams (theologian) | Roger Sherman | Roger Mayweather | Roger Lancelyn Green | Roger B. Taney |
During the filming of this episode, Nicholas Courtney (Max) and Roger Delgado (Tapiro) met for the first time; they are best known for their recurring roles in Doctor Who in the early 1970s, playing Brigadier Lethbridge-Stewart and the Master respectively.