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Fanfic / De Aged

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A Doctor Who/Harry Potter crossover. Basic premise? The Doctor and Jack are de-aged to 11-year-olds and enroll in Hogwarts, at the time of the events of The Prisoner of Azkaban, while they search for a cure to return to their true age. The Doctor gets into Gryffindor, Jack is sorted into Slytherin. Needless to say, Hogwarts will never be the same again.

The story is notable not just for its writing and characterisation, but the author's extensive knowledge of both Old!Who and New!Who continuity and above all, their scientific knowledge. It's also written by a friend of the authors of The Magic of Torchwood and Child of the Storm/The Wizard in the Shadows. Both are fans and the latter has mentioned relying on the author for scientific advice.

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It can be found here.



  • Bizarre Alien Biology: the Doctor, as usual.
  • Clarke's Third Law: Considering the canons, this was inevitable.
  • Deadpan Snarker: Since this is a pocket sized and frequently somewhat aggravated Tenth Doctor, this was inevitable. Jack sometimes gets in on the act too.
  • Fountain of Youth: the basic premise of the story is the Doctor and Jack being hit with one of these to render them vulnerable. The Doctor manages to slow it down, but not before they hit the age of 11. Intriguingly, The Nth Doctor factor is played on, with the Doctor not simply ending up in a younger version of his present body, but cycling back through his earlier bodies - however, he retains his personality and most of his memories.
  • Insufferable Genius: the Doctor, a fair bit of the time, as per usual.
  • Journey to the Center of the Mind: The Doctor has to reorganise his brain a bit, since it's an 11 year old brain trying to deal with 900 plus years of memories - even for a Time Lord brain, that's difficult. Jack makes one to get the Doctor out of a Heroic BSoD.
  • Logical Weakness: both the Doctor and Jack respond very badly to Dementors, because of the sheer volume of their bad memories. Jack, however, can generally manage. The Doctor ends up in extremely bad shape, because he's psychically sensitive and his number of bad memories puts even Jack in the shade.
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    • The Doctor's dizzy spells all over the place are initially seen to be a result of a poor job on the de-Aging potion and his own mental shields. It's Hermione using her Time-Turner throughout, which the Doctor, being an immature Time Lord, is particularly sensitive to.
  • The Nth Doctor: The Doctor, something that becomes important when the Doctor winds up in a Heroic BSoD and Jack, who makes a Journey to the Center of the Mind to get him out, encounters the Doctor's past selves on the way in.
  • Papa Wolf: The Brigadier is protective of the de-aged Doctor and highly suspicious of Jack (who he knows only as a Torchwood Agent with a near obsessive interest in the Doctor, not as a former companion).
  • Shown Their Work: The Doctor's creating an alternative recipe for a potion is, astonishingly, scientifically accurate. If it's based in continuity or real world science, then it's likely to be entirely correct.
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  • Technobabble: And unlike usual, most of it is actually based in science.
  • We All Live in America: There's a few persistent Americanisms in the prose.
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