The Doctor, Romana and K9 arrive in 1930s London to return some overdue library books. They plan to take a rest after their recent adventures, but Romana detects a distress signal from the future and the Doctor is attacked by a suffocating green mist.
Written By: Gareth Roberts, adapted by John Dorney
Directed By: Nicholas Briggs
Tom Baker (The Doctor), Lalla Ward (Romana), John Leeson (K9), Terrence Hardiman (Stackhouse), Derek Carlyle (Orlick), Richard Braine (Percy Closed), Abigail McKern (Felicia), Annabel Mullion (Julia), Mark Bonnar (Porteus), Tim Bentinck (Colonel Radlett), Andrew Bone (Woodrow), Jane Slavin (Harriet)