Dick Powell's Zane Grey Theatre (1956)

S14E9 The Deadly Assassin (1)

On Gallifrey, the home of the Time Lords, the Doctor is drawn back by a chilling vision of murder. Upon arrival, he uncovers a sinister plot brewing within the upper echelons of Time Lord society. To make matters worse, his most formidable adversary resurfaces, threatening the very survival of Gallifrey.