"Written by the creator of the #Daleks, #TerryNation, the serial starred Hartnell and Purves alongside an early appearance by #NicholasCourtney as Bret Vyon, Adrienne Hill as Katarina, and Kevin Stoney as Mavic Chen.
"Courtney would go on to play recurring character, #TheBrigadier.
"But the 'dark and gritty' 12-part storyline was ordered to be wiped, and more than half of it remains missing."














