...What kind of a fucking title is that? It sounds like some crappy live action Disney adaptation that no one gives two shits about. Christ, even The Doctor, the Widow and the Wardrobe was a better name than this.
Twice Upon A Time is the 2017 Christmas Special, the final episode featuring Peter Claptrap as Twelvey, and the closing episode of the Steven Muppet era of the show.
Good riddance Goodnight, my sweet prince.
Also known as TUAT (pronounced exactly how it looks).
/who/ brings you up to speedEdit
It's notable because it features the return of David Bradley to the show, though not as a rapist Dinosaur hoarder or as William Hartnell, but as the genuine article, the "First Doctor". This totally wasn't done because Moffat wanted everyone to think highly about his crappy era once he left.
Also asBill is back.
Also, check out the canon Twice Upon A Time page, created by one of our editors to be the true wiki entry for this story, but instantly made redundant by the predating existence of this article. (I guess you could say the page was made twice upon a time, eh? Eh? No?) However, wiki policy indicates that the more useless a page is, the more canon it is, ergo it's the most canon page of them all.
It'll be GOAT.