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Where will Peter Capaldi’s farewell rank among these classic “Doctor Who” finales?
It feels like it was yesterday when Peter Capaldi replaced Matt Smith as the legendary Doctor. But like Smith and David Tennant before him, Capaldi will set down his sonic screwdriver after three seasons on "Doctor Who" after this year's Christmas special Of course, that means that the Doctor will soon undergo another regeneration, an event which has occurred 12 times over the decades with various results. With the identity of the 13th Doctor about to be announced, here are our picks for the best and worst farewells The Doctor has given.MORE VIDEOS