The Cognition Shift (audio story)

 was the fourth and final story in the audio anthology Hearts of Darkness, produced by Big Finish Productions. It was written by Lisa McMullin and featured Derek Jacobi as and Paul McGann as the Eighth Doctor.

Publisher's summary
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Plot
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Cast

 * The Doctor / - Derek Jacobi
 * / The Doctor - Paul McGann
 * Captain Morski - Colin McFarlane
 * The Scaramancer - Luyanda Unati Lewis-Nyawo
 * Dorada - Sandra Huggett
 * Peeler - Amanda Shodeko
 * Bandit - Alex Jordan

Continuity

 * The Master in the Doctor's body says "I am the Master and you will obey me". (TV: Terror of the Autons, et all)