from top: Tom Baker as the Doctor in a publicity shot for Season 18 (1980-81); part of the futuristic set of The Leisure Hive (1980); Logopolitans, led by the Monitor (John Fraser), and Adric (Matthew Waterhouse), Tegan (Janet Fielding) and Nyssa (Sarah Sutton), are horrified to see the TARDIS shrunk down in Part Three of Logopolis (1981).