The one where the Doctor faces his fear, and loses his face...
So this is it, the end of Jon Pertwee's Third Doctor era. And although Planet of the Spiders hasn't been the swansong I wanted for him, it's nice that, at the end, Pertwee was surrounded by a good many familiar faces, whether it be Elisabeth Sladen, Nicholas Courtney, John Levene and Richard Franklin on screen, or Barry Letts, Terrance Dicks and Robert Sloman off it. And let's not forget that almost everybody else involved in Planet of the Spiders has had a hand in one of Pertwee's stories beforehand: Cyril Shaps (The Ambassadors of Death), John Dearth (The Green Death), Christopher Burgess (Terror of the Autons), Terence Lodge (Carnival of Monsters), Andrew Staines (Terror of the Autons and Carnival of Monsters), Kevin Lindsay (The Time Warrior), Pat Gorman (several), Terry Walsh (several), Stuart Fell (The Curse/ Monster of Peladon), Ysanne Churchman (The Curse/ Monster of Peladon), Walter Randall (Inferno), Max Faulkner (several) and George Cormack (The Time Monster). And let's not forget Kismet Delgado, Roger's widow, and Maureen Morris, wife of production manager George Gallaccio.
It was a veritable reunion for Pertwee, a familiar environment in which to say goodbye. But first, the viewers must say goodbye too...