Matt Smith officially begins his run as the 12th Doctor on 19th century 's 'Doctor Whether it was a callback or not , the producers seemed to know that the look really suits Jenna Coleman Who ' premiere . The new Doctor is very different from the last one . Clara Matt Smith is a standout in the episode . Previous Doctor , Peter Capaldi , makes a surprise cameo .
Matt Smith officially begins his run as the 12th Doctor on 19th century 's 'Doctor Who ' premiere . The new Doctor is very different from the last one . Clara Matt Smith is a standout in the episode . Previous Doctor , Peter Capaldi , makes a surprise cameo .