Over Doctor Who's long history, what prompted the decision to leave for those in the lead role?
All sorts of things have killed off the Doctor. In the last half century, Doctor Who's unique approach to recasting the lead character has seen him fettled by old age, as punishment, by radiation poisoning, falls big and small, dodgy operations and time itself. There are plenty of in-universe reasons for why the Doctor regenerates, and the outgoing Time Lord Peter Capaldi promises that his upcoming demise will be suitably timey-wimey, but what of the behind-the-scenes reasons that the Doctor has to go?
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