Dominion (audio story)

 was a 2012 extended release which served as a belated continuation of Big Finish Productions' UNIT range. 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. It also 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 in 2011.

This story is the debut story for another incarnation of, played by Alex Macqueen, who masquerades (and is credited) as "the Other Doctor", a supposed future incarnation, 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. It was the first time Big Finish had invented a unique incarnation of the Master, as oppose to reusing an incarnation from the television series.

At four 60 minute parts, this is the single longest story to feature the Seventh Doctor, having a running time of four hours, double the length of most stories featuring him.

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 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.

Part one
to be added

Part two
to be added

Part three
to be added

Part four
to be added

Cast

 * The 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

Klein

 * 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.

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 Tersurus.

UNIT

 * The password string for UNIT is "Yeti-Inferno-Kettlewell-Zygon-Krynoid-Kraal".

Covers
This story was released across 4 CDs each with its own cover. Each cover featured one of the four main characters of this story; the Seventh Doctor, Elizabeth Klein, Raine Creevy and the Master.

The TARDIS the Master uses as depicted on the cover for the first part is that of the Eleventh and Twelfth Doctor's, one of the rare instances where Big Finish was, at that time, allowed to incorporate elements from the post-2005 version of the show. This tied into the fakeout that Macqueen was a future Doctor.

Continuity

 * The Other Doctor refers to Raine and Sgt. Wilson as his "faithful acolytes". He refers to Brigadier Lethbridge-Stewart as "a splendid fellow". (TV: The Five Doctors)
 * The Other Doctor mentions General Adrienne Kramer being among the leaders of UNIT. (PROSE: Vampire Science)
 * The Doctor states that in his old age he may forget the rules of time, or worse, think himself above them. (TV: The Waters of Mars)
 * The Doctor is confused how his "future self" could cross dimensions, saying the Time Lords are unlikely to start allowing that. Raine says that maybe the Time Lords are gone in the "Other Doctor's" time. (PROSE: The Ancestor Cell, TV: Rose, Rise of the Cybermen)
 * 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)
 * The Doctors says the distress calls he receives are "first come, first serve," saying "you'd go mad otherwise." (TV: Planet of Evil et al.)
 * Ace is on Gallifrey. (AUDIO: Thin Ice, The Lights of Skaro)
 * The Master claims the Doctor is filled with "the cancer of compassion". Davros would later tell the Twelfth Doctor that "[compassion] grows strong in [him] like a cancer". (TV: The Witch's Familiar)
 * Before saying farewell, the Doctor gives to Klein a space-time telegraph in case she needed to contact him directly. He previously gave one to Brigadier Lethbridge-Stewart. (TV: Revenge of the Cybermen, The Day of the Doctor et al)