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Watch the trailer for the Day of the Doctor special

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Check out the special Dr Who video which has been released to mark the show's 50th anniversary.

The trailer features all 11 actors that have played the Dr, from William Hartnell to Matt Smith.

The 50th anniversary episode is called 'The Day of the Doctor' and will air on November 23, marking Matt Smith's second-to-last appearance as the Time Lord.

The new doctor is actor Peter Capaldi, who has actually starred in the show before.