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So far (end of Series 8), we have seen 13 full incarnations of the Doctor: the First to Eighth Doctors, the so-called "War Doctor" (who didn't use the name "Doctor") & the Ninth to Twelfth Doctors. We have also seen a "semi-incarnation", the Meta-Crisis Tenth Doctor (in "Journey's End"), & the "interim" manifestation known as the Watcher (in "Logopolis"). This does not rule out the possibility of additional incarnations and/or manifestations appearing in future stories.