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.

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.)