P.S. (webcast)

P.S. was a proposed DVD extra that was envisioned as a live action coda to the events of the September 2012 portion of series 7. According to its writer, however, it was cancelled when an actor's availability fell through. Its storyboards were then animated, and narration was commissioned from Arthur Darvill. Ultimately the scene was made public by the BBC as a webcast.

Synopsis
Brian Williams receives an emotional letter from his son.

Plot
The Doctor leaves with Amy and Rory after having dinner with them and Brian. A week later there is a knock at the door and Brian answers it. An American man stands there; he passes Brian a letter and walks in. Brian sits in the lounge and reads the letter revealing it is from his son Rory and that he and Amy had a wonderful life in New York, "fifty years before [Rory] was born," and adopted a son who turns out to be Anthony.

Cast

 * Rory Williams (voice) – Arthur Darvill
 * Also incorporates footage from TV: The Power of Three with Matt Smith, Karen Gillan, Darvill and Mark Williams

Continuity

 * The Angels Take Manhattan implied that Amy and Rory had been sent from the cemetery to circa 1938, the era to which Rory was first sent.
 * The Angels Take Manhattan also implied that Amy and Rory remained in or about New York City. P.S. confirms this. Anthony's sister was in New York during their parents' lifetimes, both as adult River Song in the summer of 1969, and as young Melody and infant Mels in January 1970. (TV: Day of the Moon)
 * The Doctor and his TARDIS were momentarily in Manhattan twice during Rory's and Amy's temporal exile: once carrying the First Doctor in 1966 at the Empire State Building's observation deck; and again in July 1969, piloted by the Eleventh Doctor and carrying Rory's and Amy's younger selves on the side of a skyscraper under construction. (TV: The Chase, Day of the Moon)
 * Anthony is stated to be in his mid-sixties, and to have been adopted as an infant in 1946. However, The Power of Three and P.S. take place in or after 2020, by which time, Anthony would be in his mid-seventies, barring time-travel.
 * Rory says that he realizes "having a grandson who's older than you is so far beyond weird". Rory grew up with his own daughter and also knew her as a woman considerably older than himself. Even in their youths, Mels was already several years older than Rory and Amy, despite appearing to be their age.
 * Asylum of the Daleks established Amy's inability to bear additional children after Melody, resulting from the events at Demon's Run. (TV: A Good Man Goes to War)
 * Amy and Rory are the second and third former companions shown to have adopted children, after Sarah Jane Smith. (TV: Invasion of the Bane, Sky) Ben Jackson and Polly Wright were said to have operated an orphanage in India. (TV: Death of the Doctor)
 * Rory mentions that he bought a trowel, in response to Brian's suggestion. (TV: Dinosaurs on a Spaceship)
 * Brian is watering the plants when Anthony arrives, as he told the Doctor he needed to do. (TV: The Power of Three)