Doctor Who: 5 NuWho Episodes That Were Actually Sequels Or Prequels To Classic Stories
3. The Magician's Apprentice/The Witch's Familiar
Series 9's opening two-part story serves as a sequel to the classic Fourth Doctor story, 'Genesis Of The Daleks'. In fact, the episode's main plot was spawned from an iconic quote spoken by the Fourth Doctor in 'Genesis':
"If someone who knew the future pointed out a child to you and told you that that child would grow up totally evil, to be a ruthless dictator who would destroy millions of lives, could you then kill that child?'.
The Twelfth Doctor is faced with the dilemma of whether to save a young Davros, or let him die, which would prevent the Daleks from being created. The Doctor chooses to save the young Davros, resulting in the Daleks being created with a small amount of mercy.