My Brother's Keeper (audio story)

 was the first full story in the audio anthology 1001 Nights, the December 2012 release of Big Finish Productions' Doctor Who monthly range.

Summary
The Doctor and Nyssa arrive at a prison on an asteroid in the middle of nowhere. Who is the mysterious warder and what crime has the prisoner committed?

Cast

 * The Doctor - Peter Davison
 * Nyssa - Sarah Sutton
 * Prisoner - Teddy Kempner
 * Warden - Malcolm Tierney

Continuity

 * Nyssa mentions the prisons of Folly. (AUDIO: Doing Time)
 * The Doctor refers to his encounter with Harry Houdini. Both Nyssa and the Fifth Doctor met Houdini in 1920's England. Prior to their arrival in 1963, his first incarnation and his granddaughter Susan Foreman met Houdini in the United States. Houdini taught the Doctor how to perform sleight-of-hand tricks. (AUDIO: Smoke and Mirrors, PROSE: The Sorcerer's Apprentice)