Viewers have the chance to help the Doctor fight off the threat of the Graske in this special interactive episode.
When the player is looking for the Graske in London, a boy asks for money saying he is saving up for a satsuma. This is a reference to The Christmas Invasion when The Doctor found a satsuma in his dressing gown.
This episode only goes for 15 mins instead of its usual 50-60mins.
When the TARDIS travels forwards in time the Vortex is normally Red (see End of the World), when it travels backwards in time the vortex is normally Blue (see The Unquiet Dead and Tooth and Claw). This fact is also stated on the Confidential page for Tooth and Claw on the BBC website (mouse over top left corner).
Yet in this episode, when you travel back in time, the vortex is red.
The Doctor visits London in Christmas 1883.
This episode names some of the controls on the TARDIS console.
The Dimensional Stabilizer is a large lever with a perpendicular handle.
The Vector tracker is a pair of interconnected dials, one annotated with numbers the other with a large arrow.
The Vortex loop looks like a bicycle pump sticking out of the console.
This episode features the new series first visit to an alien world, as the TARDIS lands on the planet Griffoth.
The Doctor: I need your help. So - fancy a trip in the TARDIS? (Joking) No? Not bothered? More of a bus person, yeah, I see. Come on then - what are you waiting for!?
The Doctor: Back to normal, though, there is a risk, that if you switch to ITV tonight the galaxy may implode.
The Doctor: Well done. You're good with numbers. I bet you can even do long division.
The Doctor: I could shout but then I'd give you away. I don't want to get you eaten, not at Christmas.
The Doctor: Brava, Brava. Don't know why I said that, perhaps I like Opera.
The Doctor: All the power of the sonic is yours now. So don't let the cat sit on it, you really wouldn't want that.
The Doctor: You've been watching my adventures, and I've been watching some of yours. Including you mate, where do you get the energy?
David Tennant was not listed in the end credits for this episode.
According to Doctor Who Magazine #366, this episode had the working title 'Changeling World'.
The entire episode is premised on breaking the fourth wall by directly addressing the television audience, the first time this has been explicitly done on Doctor Who since episode seven of The Daleks' Master Plan, where the First Doctor wished viewers at home a Happy Christmas. The Tenth Doctor also wishes the viewer a Merry Christmas in this episode.
This mini adventure was made playable on the BBC Doctor Who website a couple of months after it aired.
A special interactive adventure that digital BBC viewers were able to access by pressing their red button on the remote control.
The Doctor: Got as many doors as Jim Morrison.
Jim Morrison, Born December 8, 1943 - Died July 3, 1971, was the lead singer of a band from the late sixties called The Doors. Who had hits with Break on through (to the other side), Light My Fire and People Are Strange.
The Doctor: Down, down deeper and Down.
The Doctor says this when trying to find the Graske in London, on the third level of scanning. It is the chorus of a song released by Status Quo, from the album On The Level, released in 1975.
Rose does not appear in this Interactive Special. And the Doctor mentioned that he dropped off Rose in 1979 at London's Wembley Stadium for a ABBA concert.
ABBA was a Swedish pop music group, who had many hits in the 1970s and early 1980s. The name "ABBA" is made from the first letter of each member's first name:
* Agnetha Fältskog
* Björn Ulvaeus
* Benny Andersson, and
* Anni-Frid Lyngstad.
ABBA became very popular after they won the Eurovision Song Contest in 1974. They had many hits. These included "Dancing Queen", "SOS", "Mamma Mia", and "Waterloo". Most of their songs were written by Ulvaeus and Andersson.
They broke up in 1982, but their music is still popular. It has appeared in movies (including the Australian films The Adventures of Priscilla, Queen of the Desert and Muriel's Wedding) and the musical Mamma Mia.
The 1979 Concert at London's Wembley Stadium turned out to be one of the last important concert of their careers.
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