From the first Doctor Who episode in 1963, (as of 04|2014) prior to the 8th Season of the revival, there have been 769 episodes aired. However more than a hundred episodes are 'lost' meaning there are no known copies in existence.
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In total, Catherine Tate has been in 14 Doctor Who episodes. These consist of: The Runaway Bride Partners In Crime The Fires Of Pompeii Planet Of The Ood The Sontaran Strategem The Poison Sky The Doctors Daughter The Unicorn And The Wasp Silence In The Library Forest Of The Dead Midnight Turn Left The Stolen Earth Journeys End It has also been confirmed that Catherine Tate will be appearing in the final two specials entitled The End Of Time and Nightmares Reign, the last two episodes with David Tennant as The Doctor.
As the fourth doctor, he appeared in 173 episodes which aired in the years 1974 to 1981.He also appears in the TV specials Doctor Who: Shada (1992) and Doctor Who: Dimensions in Time (1993)
The Ninth Doctor had the scripts of his episodes released a few years ago in a book called Doctor Who: The Shooting Scripts
The episodes with the 456 were not in fact episodes of Doctor Who. Rather, they were episodes of the Doctor Who spin-off series Torchwood. The 456 were featured in the Torchwood episodes titled "Children of Earth: Day 1," "Children of Earth: Day 2," "Children of Earth: Day 3," "Children of Earth: Day 4," and "Children of Earth: Day 5."
There are 167 episodes.
Thirteen episodes