After fifty years of stories, it's difficult to do something new with the Daleks. They don't get reinvented the way the Doctor himself does, meaning they can start to seem stale and old. “Into the Dalek”, Peter Capaldi's second story as the Doctor, is a clear attempt to do something new with them. Intriguingly, its concept is really not all that new. It borrows heavily from other sources, including previous Doctor Who (Christopher Eccleston's “Dalek”, Tom Baker's “The Invisible Enemy”, Patrick Troughton's “The Evil of the Daleks” and so on) and completely different programmes like Fantastic Voyage and the Star Trek: The Next Generation episode “I, Borg”. But originality of concept is not really the important thing. In truth, there's no such thing as an original concept any more. What does matter, though, is what one does with the concepts, and “Into the Dalek” manages to take its various sources and swirl them together into a compelling and exciting episode of television that feels new. It takes the tired old concept of the Daleks and successfully makes them terrifying once more, while simultaneously examining the very question of what makes a person or Dalek good or evil. It doesn't offer easy answers either.