The Quantum Possibility Engine (audio story)

 was the two hundred and forty third story in Big Finish's monthly range. It was written by Guy Adams and featured Sylvester McCoy as the Seventh Doctor, Sophie Aldred as Ace and Bonnie Langford as Melanie Bush.

Notably, it saw the return of Josiah W. Dogbolter, an early Doctor Who Magazine comic character, who had previously appeared on audio in 2002's The Maltese Penguin.

Publisher's summary
The Doctor and Ace are locked up. The TARDIS is gone. Things just couldn't get worse, could they?

Of course they could. Things can always get worse — the new President of the Solar System, Josiah W Dogbolter, didn't get where he is in life without learning that. That's why he has a Quantum Possibility Engine. It's a wonderful machine, creating a wonderful Solar System. And with this wonderful device, he can bring happiness and peace to all.

Possibly.

Either that or tear the universe to shreds, it's hard to be sure which.

Plot
to be added

Cast

 * The Doctor - Sylvester McCoy
 * Ace - Sophie Aldred
 * Mel - Bonnie Langford
 * Narvin - Seán Carlsen
 * Dogbolter - Toby Longworth
 * Hob/Soldier Robots/Alex - Wayne Forester
 * Captain Regent of the Krasi - Jules de Jongh

Continuity

 * Narvin mentions dimension dams (TV: The Name of the Doctor) and vortex manipulators. (TV: The Empty Child, et al.)
 * Emoji are again established as a major form of communication for humanity in far-future centuries. (TV: Smile)
 * Upon regaining his memories, the Doctor refers to himself as a cleaner of the universe, cleaning up little messes along the way. The Tenth Doctor would later find "maintenance man of the universe" to be a rather apt self-description, along the same line of thinking. (TV: The Waters of Mars)
 * Narvin calls the Doctor's TARDIS "scrap", as it is woefully out-of-date. Other Time Lords have made similar comments. (TV: The Claws of Axos, The Ribos Operation)
 * The Doctor says he's never bothered to read the TARDIS manual. (TV: Vengeance on Varos) On other occasions, he's stated that he has read some of it, and strongly disagreed with it. (TV: The Pirate Planet, Amy's Choice)
 * Ace is shocked that the Doctor tells Mel that friends don't keep secrets from each other or plan their own schemes. (TV: Ghost Light, The Curse of Fenric, PROSE: Nightshade, Love and War, Deceit)