sentences:  "Space-Whale" was originally pitched by Pat Mills and his writing partner John Wagner in 1980 as a Fourth Doctor adventure.When the production office showed some signs of interest, Wagner left the project and the script was commissioned as a four-part Fifth Doctor story for a scene breakdown on 7 September 1981 and full scripts on 2 December 1981.The new drafts reduced the humor and the renamed "Song of the Space Whale" was now planned as the third episode of Season 20 and intended to introduce new companion Vislor Turlough.