Photo Flash: Matt Smith and David Tennant in DOCTOR WHO's 50th Anniversary Poster

BBC officially unveiled the poster for its upcoming 50th Anniversary episode of DOCTOR WHO. It features two Doctors -- Matt Smith and David Tennant -- back-to-back. Check it out below!

The BBC recently introduced its next 'Doctor' for the cult-status series DOCTOR WHO: Peter Capaldi. Capaldi, who appeared in a previous episode of DOCTOR WHO as 'Caecilius' in 2008, just acted alongside Brad Pitt in World War Z. The show's current 'Doctor' Matt Smith will exit the series after four years this winter. Smith leaves following the the 50th Anniversary in November and regenerating in the Christmas special.

DOCTOR WHO's 50th anniversary episode will air on BBC America on Saturday, November 23. The special will be broadcast all around the world at the same time and will see the reunion of Matt Smith's Doctor with David Tennant's tenth. The episode has been sold to 200 countries worldwide. It is estimated the televison event will be watched by more than 100 million viewers, making it the biggest global drama simulcast in history. It will also be shown in cinemas throughout the UK.

Doctor Who is BBC AMERICA's highest-rated series and premieres as part of the channel's Supernatural Saturday programming block.

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