Prequel

The Prequels were a series of prologues to certain episodes of Doctor Who from Series 6 and 7. They were released by the BBC on their official site. They were similar to the Tardisodes produced for Series 2.

Prequels

 * The prequel to The Impossible Astronaut.
 * The prequel to The Curse of the Black Spot.
 * The prequel to A Good Man Goes to War.
 * The prequel to Let's Kill Hitler.
 * The prequel to The Wedding of River Song.
 * The prequel to The Doctor, the Widow and the Wardrobe.
 * The prequel to Series 7.
 * The prequel to Asylum of the Daleks.

Home video release

 * The Prequels for The Impossible Astronaut, The Curse of the Black Spot, A Good Man Goes to War, Let's Kill Hitler and The Wedding of River Song were released on the Complete Series 6 DVD and Blu-ray box set in November 2011.
 * The Prequel for The Doctor, the Widow and the Wardrobe was released on the DVD of the story in January 2012.