The Last Line (audio story)

 was the fourth and final story in the audio anthology Self-Defence, produced by Big Finish Productions. It was written by Lizzie Hopley and featured Derek Jacobi as the War Master and David Tennant as the Tenth Doctor.

Publisher's summary
At the mercy of an ancient and powerful race, the Master calls upon his oldest friend in his hour of need. The problem is he doesn't recognise this incarnation of the Doctor... while the Doctor knows this Master all too well.

Plot
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Cast
to be added
 * The Master - Derek Jacobi
 * The Doctor - David Tennant

Continuity
to be added