9 January (production)


 * 1970 - Full scripts were requested from Don Houghton for The Mole-Bore, later renamed Inferno.
 * 1981 - Peter Davison filmed his first scene as the Fifth Doctor, his regeneration scene, almost a full year before the actual broadcast of the scene.
 * 2012 - Recording for Protect and Survive took place at The Moat Studios.