Prequel

The Prequels were a series of prologues to certain episodes of Doctor Who, from Series 6. 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.