Dominion (audio story)

 was the first story in Big Finish Productions' Doctor Who Special Releases range in 2012. It is separate from Big Finish's previous UNIT audio series, the last release of which, The Wasting, was released in 2005. According to Nicholas Briggs on the behind the scenes CD this story was much about doing another UNIT series featuring the Doctor, unlike the previous series which barely mentioned him. This story saw the return of Tracey Childs as Dr Elizabeth Klein who had last appeared in The Architects of History in 2010 and Beth Chalmers as Raine Creevy who last appeared in Earth Aid.

This story is the debut story for another incarnation of, played by Alex Macqueen whose character is initially portrayed (and credited) as "the Other Doctor" and for the first 3 parts of the story he is the Doctor of the story filling the role that the Doctor would normally fill in a story of this style. Nothing in the story indicates where in the Master's timeline this incarnation of the Master is located. On the behind the scenes CD Nicholas Briggs indicates this may be answered in future stories.

At four parts of 60 minute single parts this is the longest story to feature the Seventh Doctor with a running time of 4 hours, double the length of most of his Doctor's stories.

Publisher's summary
The universe stands on the brink of a dimensional crisis – and the Doctor and Raine are pulled into the very epicentre of it.

Meanwhile, on Earth, UNIT scientific advisor Dr Elizabeth Klein and an incarnation of the Doctor she's never encountered before are tested to the limit by a series of bizarre, alien invasions.

At the heart of it all is a terrible secret, almost as old as the Time Lords themselves. Reality is beginning to unravel and two Doctors, Klein, Raine and all of UNIT must use all their strength and guile to prevent the whole of creation being torn apart.

Plot
to be added

Cast

 * Seventh Doctor - Sylvester McCoy
 * Raine Creevy - Beth Chalmers
 * Dr Elizabeth Klein - Tracey Childs
 * - Alex Macqueen
 * Colonel Lafayette - Julian Dutton
 * Sergeant Pete Wilson - Bradley Gardner
 * Sylvie / Liz Morrison - Miranda Keeling
 * Private Phillips / John Starr - Ben Porter
 * Major Wyland-Jones - Sam Clemens
 * Private Maynard / Arunzell - Alex Mallinson
 * Ace - Sophie Aldred (cameo)
 * Time Lord - Nicholas Briggs (uncredited)

Individuals

 * Klein met Brigadier Lethbridge-Stewart briefly before his retirement. Major Wyland Jones describes him as "a great man" and tells Klein that UNIT files indicate that he worked with three different incarnations, namely the second, third and fourth incarnations.
 * The Other Doctor refers to Raine and Sgt. Wilson as his "faithful acolytes."

Technology

 * The Doctor hands Klein a space-time telegraph before he leaves.
 * The Master uses his Tissue Compression Eliminator to kill a Time Lord on Terserus.

Time Lords

 * The Doctor says that he and the Master shared the same upbringing.

Continuity

 * The password string for UNIT is "Yeti-Inferno-Zygon-Krynoid-Kraal". (TV: The Web of Fear, Inferno, Terror of the Zygons, The Seeds of Doom, The Android Invasion)
 * The Other Doctor mentions General Adrienne Kramer being among the leaders of UNIT. (PROSE: Vampire Science)
 * The Other Doctor reminisces about the Axons, the Autons and the Sea Devils. (TV: The Claws of Axos, Terror of the Autons, The Sea Devils)
 * The Doctor tells Raine of his past with Klein, the fact that she was a Nazi in an alternative timeline and his ultimate re-writing of her history. (AUDIO: Colditz, The Architects of History)
 * Klein mentions the "Omega business" while Major Wyland Jones refers to a meeting with more than one Doctor at the same time. (TV: The Three Doctors)
 * The Master still has Lord Chancellor Goth's TARDIS, which he stole after his death on Gallifrey. (TV: The Deadly Assassin)
 * The Master refers to the fact that the Doctor's TARDIS is the last remaining Type 40 TARDIS still in operation. (TV: The Deadly Assassin)
 * The Master tells the Doctor that he likes the sound of the phrase "Master Race." (TV: The End of Time)
 * The Master mentions the Key to Time. (TV: The Ribos Operation)