8 April (production)


 * 1966 - "The Final Test" was recorded at Riverside Studios 1. (TCH 7)
 * 1970 - Nicholas Courtney signed on for another season as Brigadier Lethbridge-Stewart.
 * 2000 - Recording for The Skymines of Karthos took place.
 * 2011 - Recording for Army of Death took place at The Moat Studios.