Prologue (webcast)

The Series 9  was a prequel to the ninth series of Doctor Who, which was released 11 September 2015 on the Doctor Who website and BBC iPlayer.

Plot
The Twelfth Doctor has returned to Karn and discusses the nature of friends and enemies with Ohila, the leader of the Sisterhood of Karn. The two discuss an invitation given to the Doctor by an unnamed individual, someone who the Doctor has known for a long time, but has been enemies with for almost all that time.

Ohila doesn't believe the Doctor when he says he will not visit him, and continues to question his reasons. Eventually the Doctor says he will go "soon", and gives Ohila an object that he says she knows who to give it to.

Cast

 * Twelfth Doctor - Peter Capaldi
 * Ohila - Clare Higgins

Story notes

 * This is the first prequel, mini-episode and webcast to feature the Twelfth Doctor.
 * This is the first time Ohila has been seen from a present standpoint in the series rather than in the past.

Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor previously met Ohila in his eighth incarnation after the Sisterhood of Karn temporarily revived him from a fatal gunship crash. Ohila then gave him the means to regenerate into his war incarnation. (TV: The Night of the Doctor)
 * The Doctor said he would "probably go meditate on a rock". He was previously meditating on top of the TARDIS. (TV: Listen)
 * The Doctor tells Ohila, "Look after the universe. I've put a lot of work into it." When he had just regenerated, the Eleventh Doctor made a similar statement to the Atraxi; while he was speaking on the Earth's behalf and the Atraxi noted he was not native to that world, the Doctor replied, "No, but I've put a lot of work into it." (TV: The Eleventh Hour)
 * Ohila is aware that the Doctor is a compulsive liar. Others who know the Doctor better have pointed this trait out. (TV: The Big Bang, Let's Kill Hitler, The Wedding of River Song)

DVD releases
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Blu-ray releases
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