Off set, this story was notorious for its troubled production and poor execution, with particular regard to the Myrka (which was negatively compared to a pantomime horse by critics). This story was beset with numerous production problems and even political considerations (Margaret Thatcher had called an election when production began, and the reference to two superpowers in the story would be seen as a reference to the Cold War). There were a number of continuity problems concerning the Silurians and Sea Devils in the original script. Editing removed many, but some remained in production.