sentences:  Michael Gough turned down the role, and the story was replaced by "Dimensions in Time".The first time the idea of a special video-only anniversary special was mooted was in a memo Nathan-Turner wrote to Head of Video Production Penny Mills on 18 February 1992.With Tom Baker not averse to appearing should conditions be met, serious thought was given to an original production and there was a meeting in June 1992 to discuss the concept of the special; by 21 July 1992 writer Adrian Rigelsford (later joined by Joanna McCaul) had completed an initial outline for the story entitled "Timeflyers".