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{{trope}}
When a notion mentioned in passing in one work becomes the full story of another work by the same author. Most often a book trope.

{{examples}}

* [[Terry Pratchett]] - ''[[Discworld|The Amazing Maurice and his Educated Rodents]]'' (started out as a passing reference in ''Reaper Man'')
* Douglas Adams - ''[[Starship Titanic]]'' (started out as a passing reference in one of the ''[[The Hitchhikers Guide to The Galaxy (Literature)|The Hitchhikers Guide to The Galaxy]]'' books)
* The [[Star Wars]] expanded universe does this kind of all the time. Not only is a backstory provided for every character who appeared onscreen in the movies (and even some of the [[Faceless Goons]]), but you also get stories that explain exactly what a "nerf herder" is.
* ''Nevada'' - Courtesy [[The Other Wiki]] [http://en.wikipedia.org/wiki/Nevada_(comics)]: "The origin of the character is to be found in a ''[[Howard the Duck (Comic Book)|Howard the Duck]]'' story that contained a "mandatory fight scene" between a Las Vegas chorus girl, an ostrich and a standing lamp. [[Neil Gaiman]] said he'd like to see that story. So when Gerber was asked to come with something original by Vertigo editor Karen Berger, he created Nevada."
* [[China Mieville]]'s [[Bas-Lag Cycle (Literature)|Bas-Lag Cycle]] is full of these. Among a great many other things, the protagonist of ''[[The Scar (Literature)|The Scar]]'' is mentioned in one line of ''[[Perdido Street Station]]'' as being Isaac's last girlfriend.
* ''[[The Legend of Zelda Ocarina of Time]]'' is an expansion of the prologue detailed in ''[[The Legend of Zelda a Link To The Past|A Link to the Past]]'''s intro cutscene. There is one deviation from the prologue, though: in ''Ocarina of Time'', {{spoiler|Link lives.}}
* [[The Lord of the Rings|Sauron]] was briefly alluded to in ''[[The Hobbit]].''

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[[Category:Derivative Works]]
[[Category:Sidenote Full Story]]