Persuasion (audio story)

 was the first story in the 2013 Seventh Doctor audio trilogy. It was the one hundred and seventy-fifth story in Big Finish's monthly range, and was the first appearance of companion Will Arrowsmith.

Publisher's summary
The Umbrella Man is back. But when the Doctor recruits UNIT's Scientific Adviser Elizabeth Klein for an off-the-books mission to the apocalyptic final days of Hitler's Germany, he isn't expecting Klein's hapless young assistant, Will Arrowsmith, to be joining them too.

The Doctor isn't the only alien creature seeking to loot a very particular secret from a Nazi base in Dusseldorf, however. Strange and sinister beings are converging on the same time/space location in search of the scientist Schalk, whose experiments are the key to a devastating power...

The power of Persuasion.

Cast

 * The Doctor - Sylvester McCoy
 * Dr Elizabeth Klein - Tracey Childs
 * Will Arrowsmith - Christian Edwards
 * Kurt Schalk - David Sibley
 * Lukas Hinterberger - Jonathan Forbes
 * The Shepherd/Bondsman Tango-Veldt - Paul Chahidi
 * The Shepherdess/Acquisitor Prime - Miranda Raison
 * Casta/The Sylph/Khlecht - Gemma Whelan

Continuity

 * Klein asks the Doctor where Raine is, having previously met her in AUDIO:  Dominion.