Relative Dimensions (audio story)

Relative Dimensions was the seventh release of the fourth series of Eighth Doctor Adventures and also the Big Finish's 2010 Christmas special release. It featured Lucie Miller, Susan, and Alex Campbell. In this adventure, the Doctor intended to spend Christmas with Susan and Alex, his great-grandson whom he had met for the first time in the audio story An Earthly Child. But a present he got for Susan a long time ago, in the audio story Quinnis, may jeopardize the perfect Christmas he had promised Lucie to make it up to her for their previous disastrous Christmas described in Death in Blackpool. This story was the only story on television or audio where the Doctor celebrated Christmas with his family.

Publisher's summary
Christmas is a time for family, they say — which is why the Doctor has invited his grand-daughter Susan and great-grandson Alex for Christmas dinner in his time and space machine. But who, or what, is the spectre at their yuletide feast?

Venturing deep into the dark heart of the TARDIS, Susan uncovers her past, Alex is told his future — and the Doctor finds himself caught in a deadly dangerous present!

Plot
to be added

Cast

 * The Doctor - Paul McGann
 * Lucie Miller - Sheridan Smith
 * Susan Campbell - Carole Ann Ford
 * Alex Campbell - Jake McGann

Continuity

 * Lucie mentions the death of her aunt Patricia Ryder on 25 December 2009. (AUDIO: Death in Blackpool)
 * The Doctor refers to "windswept monasteries." (AUDIO: The Book of Kells)
 * Alex recalls meeting his great-grandfather, the Doctor, for the first time six months earlier. (AUDIO: An Earthly Child)
 * Susan and Alex have not had a proper family Christmas since the death of her husband David Campbell. (PROSE: Legacy of the Daleks)
 * Susan mentions that the Doctor has not regenerated since they last met, which he describes as "a bit of a novelty" for her. (TV: The Five Doctors, AUDIO: An Earthly Child)
 * Susan remembers being abandoned on Earth by the Doctor following the end of the Dalek occupation. (TV: The Dalek Invasion of Earth)
 * Susan tells her grandfather that the Iborians were sincere in their desire to render assistance in rebuilding Earth and that they have already accomplished much in the previous six months. (AUDIO: An Earthly Child)
 * Susan refers to the Doctor's recklessness in lying to herself and their former travelling companions Ian Chesterton and Barbara Wright about the fluid link being broken so to provide an excuse to explore in the Dalek city on Skaro. (TV: The Daleks)
 * As a Christmas present, the Doctor gives Susan the Aztec bracelet which Cameca had previously given to him as an engagement present in Mexico in the 15th century. (TV: The Aztecs) It had seemingly re-entered his possession as the First Doctor had previously used it to buy suits and top hats for himself and Steven Taylor in London in 1912. (AUDIO: The Suffering) The Seventh Doctor previously wore it on the lapel of his cream linen suit. (PROSE: White Darkness)
 * Susan tells Alex that the Doctor bought her a dried air fish from a market in Bridgetown on Quinnis in the fourth universe many years earlier. (AUDIO: Quinnis) However, she left it behind along with the rest of her possessions when the Doctor locked her out of the TARDIS. (TV: The Dalek Invasion of Earth)
 * The Blitzen fish ruins the Thal cloak which Alydon had given Susan on Skaro. (TV: The Daleks)
 * The Fledershrews had resided in the TARDIS since at least the Doctor's previous incarnation. (AUDIO: Black and White)