From the Daleks to the Weeping Angels to The Silence, Doctor Who has battled enemies scary and scarier. Take a look at some of his most fearsome foes during his 50 years on TV, some that will make an encore appearance in the 50th anniversary special "The Day of the Doctor" on Nov. 23. Leave a comment and tell your favorites, or which villain you think is the Doctor's greatest adversary. Curt Wagner, RedEye's Show Patrol
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