VIDEO: Watch Teaser for DOCTOR WHO's 'Day of the Doctor'

The centerpiece of BBC AMERICA's celebrations of Doctor Who's 50th Anniversary is Doctor Who: The Day of the Doctor, written by Steven Moffat. The Doctors (Matt Smith and David Tennant) embark on their greatest adventure across space and time. In 2013, something terrible is awakening in London's National Gallery; in 1562, a murderous plot is afoot in Elizabethan England; and somewhere in space an ancient battle reaches its devastating conclusion. All of reality is at stake as the Doctor's own dangerous past comes back to haunt him. Starring Matt Smith, David Tennant, Jenna Coleman, with Billie Piper and John Hurt.

Last seen as the Doctor on January 1, 2010, this will be the first time David Tennant has reprised his role as the Tenth Doctor. During his Reign as the Time Lord, Tennant appeared in three seasons as well as several specials. He was first revealed as the Doctor in the 2005 season finale, The Parting of the Ways. Meanwhile Billie Piper, who played companion Rose Tyler for two seasons following the reboot in 2005, will appear in the show for the first time since featuring in David Tennant's last episode, The End of Time in 2010. The special is directed by Nick Hurran, executive produced by Steven Moffat, Faith Penhale and produced by Marcus Wilson.

Doctor Who: The Day of the Doctor encore Primetime broadcast - 7:00pm ET. BBC America will premiere exclusive Inside Look interviews with Matt Smith and David Tennant during the broadcast. The special will be followed by the premiere of new fantasy-adventure series Atlantis at 9:00pm ET.

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