[[quoteright:250:[[VideoGame/ZeldaIITheAdventureOfLink http://static.tvtropes.org/pmwiki/pub/images/zelda_2_backstory_5390.jpg]]]]
[[caption-width-right:250:[-'''Above''': You see how epic and [[TearJerker tragic]] the SaveThePrincess plot is.\\
'''Below''': You probably pressed "Start" [[PlayTheGameSkipTheStory before this text even showed up]].-] ]]

->''"The name of this world is Nalthis, by the way. Franchise/{{Mistborn}} takes place on a world called Scadrial, and Literature/{{Elantris}} on a world known as Sel. See the fun things you learn by reading annotations?"''
-->-- '''Creator/BrandonSanderson'''

Information not mentioned within a specific work, but only found in supplemental material or in other works within the franchise. The significance of the info varies; it can be anything from little backstory details that clarify minor points, to information that is ''critical to understanding the plot''.

For example, many anime [[OriginalVideoAnimation OVAs]] based on a manga begin InMediasRes and rarely explain themselves under the assumption an OVA (being an occasional test run for a series) will typically be watched by someone who has read the original manga.

Other information can be found in text novels, video games, [[AudioAdaptation radio dramas]], and {{image song}}s, as the entire franchise is treated as a package. Though, if you don't have the money for all that, there's always Wiki/TVTropes and Wiki/ThatOtherWiki. When done to extremes, CrackIsCheaper.

Fairly common in {{anime}} and mostly unknown in American shows, although it seems to be steadily picking up speed with shows like ''Series/{{Lost}}''. However, it's very common in American comic books because of the assurance that the stereotypical fan is obsessive enough to collect supplemental material (see UltimateUniverse). This also applies to the elaborate backstories many video games of the 1980s provided in accompanying comic books or novellas.

A common response to people who complain about TheFilmOfTheBook not making sense is that they should have read the book. Naturally there is disagreement on whether this is fair; some believe that a movie should stand on its own, while others feel that those who care enough to complain should care enough to read.

Related tropes include:
* AllThereInTheScript is a closely related trope for when the names of characters or other things are not revealed within the work, but can be found in other materials such as production scripts, supplemental material, closed captioning, etc.
* AdaptationInducedPlotHole, when a PlotHole in an adapted work results from the omission of some information from the source material
* DeletedScene (in cases where plot holes and such are caused by the relevant information being in a scene that was cut for time or other reasons)
* GuideDangIt, when it's nearly impossible to progress in a game without information that's difficult or impossible to find in the game itself, and must be looked up from a guide or other external source
* WordOfGod, where information not given in any part of the franchise is stated by the creator using some out-of-universe format, such as an interview or a personal blog

Not to be confused with ReadTheFreakingManual, which refers to the oversight of not reading the manual despite it containing important practical information.
* AllThereInTheManual/AnimatedFilms
* AllThereInTheManual/AnimeAndManga
* AllThereInTheManual/ComicBooks
* AllThereInTheManual/ComicStrips
* AllThereInTheManual/FanFic
* AllThereInTheManual/{{Literature}}
* AllThereInTheManual/LiveActionFilms
* AllThereInTheManual/LiveActionTV
* AllThereInTheManual/{{Music}}
* AllThereInTheManual/{{Pinball}}
* AllThereInTheManual/TabletopGames
* AllThereInTheManual/{{Theatre}}
* AllThereInTheManual/ThemeParks
* AllThereInTheManual/{{Toys}}
* AllThereInTheManual/VideoGames
* AllThereInTheManual/WebComics
* AllThereInTheManual/WebOriginal
* AllThereInTheManual/WesternAnimation

* The only way to know without a doubt who is who in ''Art/TheLastSupper'' is to look at Creator/LeonardoDaVinci's notes that specified which names of each individual in the painting. Sure, Jesus was easy to spot out, but it's harder to tell the androgynous figure next to Christ is John without Leonardo's confirmation.