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
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 * / The Doctor - Derek Jacobi
 * The Doctor / The Master - Paul McGann

Continuity
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