The Bells of Saint John: A Prequel (webcast)

 was the prequel to The Bells of Saint John the sixth episode of the seventh series of Doctor Who.

Synopsis
The Doctor takes a break on Earth, despondent that he can't find Clara.

Plot
A little girl helps the Doctor discover a solution to finding his friend, Clara Oswin Oswald. The Doctor doesn't realise that the little girl is actually Clara herself. Clara's mother appears and scolds her for talking to a stranger.

Cast

 * The Doctor - Matt Smith
 * Clara Oswald - Sophie Downham
 * Ellie Oswald - Nicola Sian

Crew

 * Writer - Steven Moffat

Story notes

 * This is the last canonical appearance of the Eleventh Doctor's Shetland Tweed Jacket. (TV: A Christmas Carol)

Continuity

 * The Doctor is looking for a third Clara. (TV: The Snowmen)
 * The little girl comments on the Doctor's age. (TV: The Impossible Astronaut, Closing Time)
 * The Doctor references having lost "a friend" twice. (TV: Asylum of the Daleks, The Snowmen)
 * The little girl is the third Clara, who became a regular companion. (TV: The Rings of Akhaten) However, her older self doesn't appear to recognise the Doctor when they first meet. (TV: The Bells of Saint John)
 * This is at least the second time the Doctor has first met a future companion while she is still a child. (TV: The Eleventh Hour)