The story takes place in a apartment building called "Paradise Towers" inhabited by gangs of girls (the Kangs), cannibalistic old ladies (the Rezzies) and dictatorial caretakers. The inhabitants are being killed off by giant cleaning machines at the behest of the Great Architect Kroagnon, the building's creator.
The story was written by Stephen Wyatt and directed by Nicholas Malett. The cast also includes Richard Briers (Chief Caretaker), Clive Merrison (Deputy Chief), Brenda Bruce (Tilda), Elizabeth Spriggs (Tabby), Julie Brennon (Fire Escape), Annabel Yuresha (Bin Liner) and Howard Cooke (Pex).
See also List of Doctor Who serials