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** ''{{Gargoyles}}''' WordOfGod, GregWeisman, says it shares its universe with ''AtlantisTheLostEmpire'' - or at least, each 'verse includes a BroadStrokes version of the other franchise. (This occurred when Weisman worked on an ''Atlantis'' TV spinoff - but the series, including the ''Gargoyles'' CrossThrough episode, got canned when the movie bombed.)
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* While KimNewman has seeded connections between his books since the beginning, the short story "Cold Snap" seems to be a concentrated effort to tie them ''all'' together. A "Diogenes Club" story (and therefore featuring characters whose AlternateUniverse selves appear in the ''Anno Dracula'' novels) it adds characters from his early work such as ''Jago'', and even features the villain from his ''DoctorWho'' novella ''Time And Relative''.

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* While KimNewman has seeded connections between his books since the beginning, the short story "Cold Snap" seems to be a concentrated effort to tie them ''all'' together. A "Diogenes Club" story (and therefore featuring characters whose AlternateUniverse selves appear in the ''Anno Dracula'' ''AnnoDracula'' novels) it adds characters from his early work such as ''Jago'', and even features the villain from his ''DoctorWho'' novella ''Time And Relative''.
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* PowerpuffGirlsDoujinshi merges the Powerpuff Girls with Dexter's Lab, Samurai Jack, My Life as a Teenage Robot, and countless others.
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** The first connection was actually FinalFantasyIX, which was a millenia-later sequel to FinalFantasyI.

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** Ian Edginton does the same thing with his ''2000 AD'' strips: both ''Stickleback'' and ''The Red Seas'' share a secret organisation, little mentions and character cameos abound, and the same brand of EldritchHorror appears in ''Stickleback'', ''Ampney Crucis Investigates'', and arguably ''Detonator X''.

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** Ian Edginton does the same thing with his ''2000 AD'' strips: both ''Stickleback'' and ''The Red Seas'' share a secret organisation, little mentions and character cameos abound, and the same brand of EldritchHorror appears in ''Stickleback'', ''Ampney Crucis Investigates'', and arguably ''Detonator X''.X''.
** John Smith did a similar thing from the start in order to make his stories stand out: all his initial ''Future Shocks'' linked in to an organisation called Indigo Prime, and a couple of Indigo Prime agents also appeared in ''Tyranny Rex''. Indigo Prime then got its own series, and eventually crossed over with Smith's {{DC}} series, ''Scarab''.
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**Understandable, as the previews did the same with 18th century France and Caribbean, pre-medieval Arabia, and Sub-Saharan Africa.

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* The canons of {{Tsukihime}}, FateStayNight, and KaraNoKyoukai (plus others) are generally grouped together and called the NasuVerse. There's rarely direct crossover of the characters, except in [[BattleMoonWars spin-off]] [[MeltyBlood games]] and non-canon side-comics. WordOfGod on each canon's characters respective power levels in relation to each other ([[MemeticMutation can Shiki kill Servants?]]) is [[FlipFlopOfGod conflicting]].

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* The canons of {{Tsukihime}}, FateStayNight, and KaraNoKyoukai (plus FateStayNight(plus others) are generally grouped together and called the NasuVerse. There's rarely direct crossover of the characters, except in [[BattleMoonWars spin-off]] [[MeltyBlood games]] and non-canon side-comics. WordOfGod on each canon's characters respective power levels in relation to each other ([[MemeticMutation can Shiki kill Servants?]]) is [[FlipFlopOfGod conflicting]].conflicting]].
** Except KaraNoKyoukai which, by WordOfGod, explicitly isn't in the same universe as Tsukihime.
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* All of Christopher Moore's varied books appear to take place in the same verse, whether the setting is modern suburbian California or Israel in Jesus' time. Various characters make appearances outside of their respective novels, like angels and vampires and fruit bats.

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* All of Christopher Moore's {{Christopher Moore}}'s varied books appear to take place in the same verse, whether the setting is modern suburbian California or Israel in Jesus' time. Various characters make appearances outside of their respective novels, like angels and vampires and fruit bats.
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**ZO and J fight a multi-seasonal batch of monsters in Kamen Rider World (8-minute theme park thingy, may not be canon but never said not to be, and not contradicting anything) which puts ''all three'' hiatus movies (yes, Shin provided a monster) into old-school KR continuity. Kuuga's mention of a Professor Hongo (and an imitation of him, which means he ''must'' have known ''the'' Hongo) put Kuuga and Agito into it as well. However, Decade makes the multiverse more complicated with its AR worlds bearing variable resemblence to - and ''rarely'' literally being - the worlds of the actual series it's crossing over with. We even get Black and Black RX as separate worlds, as well as Kuuga and Agito, with alternate versions of some of the same people.
**ItGetsWorse: Some worlds have versions of Riders of other worlds with no dimension-hopping. For example, Dark Kabuto, Dark Kiva, Ryuga, and Orga live in a world where monsters rule, and have no connection to ''Kabuto, Kiva, Ryuki,'' or ''Faiz.'' It's the ''second'' Ryuga we meet, and no, the first wasn't in the World of Ryuki, either.) It also means Double and OOO take place in the World of the Rider War, as Double does no dimension hopping to meet Decade, and OOO does no dimension hopping to meet Double.
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** This was mostly done as an attempt to use ''Dr. Slump''[='=]s popularity to help increase readership of ''Dragon Ball'', as it wasn't the huge hit it would eventually become yet. Ironically, in later years the crossover has had the opposite effect: many fans, especially outside of Japan, only know the ''Dr. Slump'' cast because of their guest spot on ''Dragon Ball''.

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** This was mostly done as an attempt to use ''Dr. Slump''[='=]s popularity to help increase readership of ''Dragon Ball'', as it wasn't the huge hit it would eventually become yet. Ironically, in later years In contrast, the crossover has had the opposite effect: effect in later years: many fans, especially outside of Japan, only know the ''Dr. Slump'' cast because of their guest spot on ''Dragon Ball''.

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* HPLovecraft's story ''The Dream-Quest of Unknown Kadath'' ties most of his early standalone [[ShortStory short stories]] into the Dreamlands Cycle, and also brings in ''Pickman's Model'' and the Randolph Carter stories. At the end, the Dreamlands Cycle is linked to the CthulhuMythos, though a few stories (such as the early "Dagon") ''may'' be outside the grand continuity. Several other authors have expanded this, notably August Derleth and {{Clark Ashton Smith}}.

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* The CthulhuMythos is full of this:
**
HPLovecraft's story ''The Dream-Quest of Unknown Kadath'' ties most of his early standalone [[ShortStory short stories]] into the Dreamlands Cycle, and also brings in ''Pickman's Model'' and the Randolph Carter stories. At the end, the Dreamlands Cycle is linked to the CthulhuMythos, though a few stories (such as the early "Dagon") ''may'' be outside the grand continuity. Several other authors have expanded this, notably August Derleth AugustDerleth and {{Clark Ashton Smith}}.


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** ClarkAshtonSmith's Xiccarph and Zothique series were not originally connected to the CthulhuMythos. They were tied into the Mythos by later writers.
** Lovecraft and others also tied some works by earlier writers into the Mythos:
*** RWChambers' ''{{The King in Yellow}}'' (referenced in "The Whisperer in Darkness").
*** Occasional references to LordDunsany's fiction, such as the city of Bethmoora.
*** A few references to ArthurMachen, such as the Aklo language.

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* There's a curious variation of this with Marvel's UK comics, their british branch. In addition to reprinting Marvel Comics, they also created their own, original characters (Death's Head probably being the best known) that were assumed to be part of the MarvelUniverse from the start; many Marvel heroes starred in their series, but the American comics rarely if ever acknowledged them. Technically they are still canon, though most of them haven't been seen since the 90's and almost never get mentioned today.

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* There's a curious variation of this with Marvel's UK comics, their british branch. In addition to reprinting Marvel Comics, they also created their own, original characters (Death's Head probably being the best known) that were assumed to be part of the MarvelUniverse from the start; many Marvel heroes starred [[{{Crossover}} guest starred]] in their series, but the American comics rarely if ever acknowledged them. Technically they are still canon, though most of them haven't been seen since the 90's and almost never get mentioned today.
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* There's a curious variation of this with Marvel's UK comics, their british branch. In addition to reprinting Marvel Comics, they also created their own, original characters (Death's Head probably being the best known) that were assumed to be part of the MarvelUniverse from the start; many Marvel heroes starred in their series, but the American comics rarely if ever acknowledged them. Technically they are still canon, though most of them haven't been seen since the 90's and almost never get mentioned today.
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* The ''{{GURPS}}'' Infinite Worlds setting ties together every alternate universe they ever came up with and every licensed work ever adapted to ''GURPS'' from ''{{Uplift}}'' to ''{{Diskworld}}'' to ''{{Hellboy}}''.

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* The ''{{GURPS}}'' Infinite Worlds setting ties together every alternate universe they ever came up with and every licensed work ever adapted to ''GURPS'' from ''{{Uplift}}'' to ''{{Diskworld}}'' ''{{Discworld}}'' to ''{{Hellboy}}''.
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** ''SomethingPositive'' shares world with ''Queen Of Wands'', ''Scandal Sheet'', ''Girls With Slingshots'', ''QuestionableContent'', ''{{Shortpacked}}'', and ''Penny and Aggie''. Recently, for instance, the cats from S* P and GWS had a litter of hypoallergenic kittens.

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** ''SomethingPositive'' shares world with ''Queen Of Wands'', ''QueenOfWands'', ''PunchAnPie'', ''Scandal Sheet'', ''Girls With Slingshots'', ''QuestionableContent'', ''{{Shortpacked}}'', and ''Penny and Aggie''. Recently, for instance, the cats from S* P and GWS had a litter of hypoallergenic kittens.
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** ''SomethingPositive'' shares world with ''Queen Of Wands'', ''Scandal Sheet'', ''Girls With Slingshots'', ''QuestionableContent'' and ''Penny and Aggie''. Recently, for instance, the cats from S* P and GWS had a litter of hypoallergenic kittens.

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** ''SomethingPositive'' shares world with ''Queen Of Wands'', ''Scandal Sheet'', ''Girls With Slingshots'', ''QuestionableContent'' ''QuestionableContent'', ''{{Shortpacked}}'', and ''Penny and Aggie''. Recently, for instance, the cats from S* P and GWS had a litter of hypoallergenic kittens.
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** ''MaskedRider'', the [[SoBadItsHorrible not well received]] American adaptation of ''Black RX'' was launched with a PoorlyDisguisedPilot in a ''MightyMorphinPowerRangers'' episode; much later, ''PowerRangersInSpace'' crossed over with ''TeenageMutantNinjaTurtles: The Next Mutation'', which makes all three American series share a Verse. All three are produced by Saban, which wasn't so bad back then, but as of 2009...

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** ''MaskedRider'', the [[SoBadItsHorrible not well received]] American adaptation of ''Black RX'' was launched with a PoorlyDisguisedPilot in a ''MightyMorphinPowerRangers'' episode; much later, ''PowerRangersInSpace'' crossed over with ''TeenageMutantNinjaTurtles: ''[[NinjaTurtlesTheNextMutation Ninja Turtles: The Next Mutation'', Mutation]]'', which makes all three American series share a Verse. All three are produced by Saban, which wasn't so bad back then, but as of 2009...

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* [[http://www.bleedingcool.com/2009/10/01/the-mark-millar-tie-up-athon-spoilers/ This article]] suggests that all of [[MarkMillar Mark Millar]]'s recent Marvel work (''1985'', ''FantasticFour'', ''KickAss'', and ''[[{{Wolverine}} Old Man Logan]]'') is all interconnected.

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* [[http://www.bleedingcool.com/2009/10/01/the-mark-millar-tie-up-athon-spoilers/ This article]] suggests that all of [[MarkMillar Mark Millar]]'s recent Marvel work (''1985'', ''FantasticFour'', ''KickAss'', and ''[[{{Wolverine}} Old Man Logan]]'') is all interconnected. interconnected.
** Even ealier Millar estabilished connections between three comics published by different companies - {{Wanted}}, ''Chosen'' and TheUnfunnies. The reason why at the end of the ''Chosen'' [[spoiler: media doesn't report Antichrist's miracles is that they're controlled by supervillains from ''Wanted'']]. And Troy Hicks from ''Unfunnies'' [[spoiler: helped Satan rape Antichrist]]. Never published ''Run!'' was supposed to be set in that world too.
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** Seriously, the [[VirginNewAdventures New Adventures]] novel ''Damaged Goods'', which Davies wrote before being handed the series revival, has a scene near the end featuring a UNIT investigator who is implied to be the protagonist of his earlier series ''DarkSeason''.
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* There have been countless''Transformers''/''GIJoe'' crossover comics and, even worse, the ''Transformers'' comic character Death's Head, who was then involuntarily sent to the ''DoctorWho'' universe (in the comics only) and then the MarvelUniverse, bringing things full circle... except that ''Who'' crossed over with not just ''Blake's Seven'' as mentioned above, but also SherlockHolmes '''and''' the CthulhuMythos in the DoctorWhoExpandedUniverse novel ''All-Consuming Fire'' and... '''[[PublicDomainCharacter for the sake of Primus, we better stop at Holmes and the Mythos or else this dysfunctional multiverse will be too big for this page...]]''' In fact, given that ''Doctor Who'' is also part of Westphall's mind, what we've got here is a truly dysfunctional mess of a multiverse, lest we forget that there is also existence of a what is most likely a [[http://img.photobucket.com/albums/v283/factorialinfinity/prlggallifrey.jpg Post-Time War Gallifrey]] in the Power Rangers Universe.

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* There have been countless''Transformers''/''GIJoe'' crossover comics and, even worse, the ''Transformers'' comic character Death's Head, who was then involuntarily sent to the ''DoctorWho'' universe (in the comics only) and then the MarvelUniverse, bringing things full circle... except that ''Who'' crossed over with not just ''Blake's Seven'' as mentioned above, but also SherlockHolmes '''and''' the CthulhuMythos in the DoctorWhoExpandedUniverse [[VirginNewAdventures Doctor Who New Adventures]] novel ''All-Consuming Fire'' and... '''[[PublicDomainCharacter for the sake of Primus, we better stop at Holmes and the Mythos or else this dysfunctional multiverse will be too big for this page...]]''' In fact, given that ''Doctor Who'' is also part of Westphall's mind, what we've got here is a truly dysfunctional mess of a multiverse, lest we forget that there is also existence of a what is most likely a [[http://img.photobucket.com/albums/v283/factorialinfinity/prlggallifrey.jpg Post-Time War Gallifrey]] in the Power Rangers Universe.
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** Ian Edginton does the same thing with his ''2000 AD'' strips: both ''Stickleback'' and ''The Red Seas'' share a secret organisation, ''The Red Seas'' and ''Defoe'' share an apparently immortal Isaac Newton, little mentions and character cameos abound, and the same brand of EldritchHorror appears in ''Stickleback'', ''Ampney Crucis Investigates'', and arguably ''Detonator X''.
* AlanMoore, as time has gone on, has turned ''LeagueOfExtraordinaryGentlemen'' into this, making vague references to the source material for Ozymandias and the Black Freighter. Oh, sure, it's only references to the inspirations for them, and Moore would probably rather have his skin boiled then actually go further then that, but this is AlanMoore, ''there are no coincidences''.
** That's a bit of an odd example, since the League already existed in a world where [[AllMythsAreTrue All]], and we mean really [[AllMythsAreTrue All, Myths Are True]]. Volumes one and two of the ''LeagueOfExtraordinaryGentlemen'' comics were entirely populated by {{Historical Domain Character}}s, so a few characters created by the author is only a very small step further.

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** Ian Edginton does the same thing with his ''2000 AD'' strips: both ''Stickleback'' and ''The Red Seas'' share a secret organisation, ''The Red Seas'' and ''Defoe'' share an apparently immortal Isaac Newton, little mentions and character cameos abound, and the same brand of EldritchHorror appears in ''Stickleback'', ''Ampney Crucis Investigates'', and arguably ''Detonator X''.
* AlanMoore, as time has gone on, has turned ''LeagueOfExtraordinaryGentlemen'' into this, making vague references to the source material for Ozymandias ''Ozymandias'' and the ''The Black Freighter.Freighter''. Oh, sure, it's only references to the inspirations for them, and Moore would probably rather have his skin boiled then actually go further then that, but this is AlanMoore, ''there are no coincidences''.
** That's a bit of an odd example, since the League already existed in a world where [[AllMythsAreTrue All]], all and we mean really [[AllMythsAreTrue All, Myths Are True]].myths are true]]. Volumes one and two of the ''LeagueOfExtraordinaryGentlemen'' comics were entirely populated by {{Historical Domain Character}}s, so a few characters created by the author is only a very small step further.
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* Fantasy author MichaelMoorcock gradually connected almost every single character he'd created into a MythArc revolving around the concept of the [[CosmicPlaything Eternal Champion]].

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* Fantasy author MichaelMoorcock gradually connected almost every single character he'd created into a MythArc revolving around the concept of the [[CosmicPlaything Eternal Champion]]. Indeed, this article was originally titled "The Moorcock Effect" in reference to him.
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This is the tendency of long-lived genre authors to, at what is usually a later point in their career, combine two or more distinct series they've created into a single continuity. By combining the two series together, the author can introduce fans of one series to characters they may not be familiar with, inducing them to go out and buy the works in that series, and hopefully attract high sales from fans of both storylines. When done well, it can add a more epic feel to the tale, explore aspects of the two storylines not previously delved into, and make lots of money for the author and his publisher (and there are many examples of this, perhaps most famously ''{{Lord of the Rings}}''). When done poorly, especially with stories with radically different settings or styles, it looks and feels like a shallow money-grab and can potentially be a [[JumpTheShark shark-jumping]] moment for both series.

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This CanonWelding is the tendency of long-lived genre authors to, at what is usually a later point in their career, combine two or more distinct series they've created into a single continuity. By combining the two series together, the author can introduce fans of one series to characters they may not be familiar with, inducing them to go out and buy the works in that series, and hopefully attract high sales from fans of both storylines. When done well, it can add a more epic feel to the tale, explore aspects of the two storylines not previously delved into, and make lots of money for the author and his publisher (and there are many examples of this, perhaps most famously ''{{Lord of the Rings}}''). When done poorly, especially with stories with radically different settings or styles, it looks and feels like a shallow money-grab and can potentially be a [[JumpTheShark shark-jumping]] moment for both series.
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Thought of adding the example of Butterworth and Gryce, but it turns out that represents a spin-off at best.

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* ''MegaManLegends'' was originally in its own continuity (hence jokes and references to the original series being a ShowWithinAShow). However, the recent ''MegaManZero'' and ''MegaManZX'' games have more directly connected it as being the far distant future of the original ''MegaMan'' and ''MegaManX''.

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* ''MegaManLegends'' was originally in its own continuity (hence jokes and references to the original series being a ShowWithinAShow). However, the recent ''MegaManZero'' and ''MegaManZX'' games have more directly connected it as being the far distant future of the original ''MegaMan'' ''Game/MegaMan'' and ''MegaManX''.

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* DCComics' new [[TheMultiverse Multiverse]] includes many universes that used to be considered non-canon {{Elseworld}} stories, such as ''SupermanRedSon'', ''KingdomCome'', and even ''BatmanBeyond'' (and the rest of the DCAU by extension). This allowed for some interesting crossovers, such as when Earth-22 (KingdomCome) Superman teamed up with the [[JusticeSocietyOfAmerica Justice Society]] of the main DC Earth.
** Not necessarily the entire DCAU. The Terry McGinnis Batman of the DC Multiverse (and the history of his Earth) doesn't have to correspond to the details of the ''Batman Beyond'' cartoon any more than the Bruce Wayne Batman of the main DCU corresponds to the details of ''Batman: The Animated Series.''

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* DCComics' new [[TheMultiverse Multiverse]] includes many universes that used to be considered non-canon {{Elseworld}} stories, such as ''SupermanRedSon'', ''KingdomCome'', and even ''BatmanBeyond'' (and the rest of the DCAU by extension). ''BatmanBeyond'' . This allowed for some interesting crossovers, such as when Earth-22 (KingdomCome) Superman teamed up with the [[JusticeSocietyOfAmerica Justice Society]] of the main DC Earth.
** Not necessarily the entire DCAU. The Terry McGinnis Batman of the DC Multiverse (and the history of his Earth) doesn't have to correspond to the details of the ''Batman Beyond'' cartoon any more than the Bruce Wayne Batman of the main DCU corresponds to the details of ''Batman: The Animated Series.''
Earth.
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Joke crossref no longer works when the trope isn't named for Michael Moorcock any more.


Whether it's an example of a well-done or a poorly-done crossover is a matter of contention. Not related to the ScunthorpeProblem.

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Whether it's an example of a well-done or a poorly-done crossover is a matter of contention. Not related to the ScunthorpeProblem.\n
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Is this necessary? Also, Russell shares a lot of first names and surnames with other shows of his. Also, what? Please elaborate. I don't recall Quatermass being said to be fictional or real from the context, and the rest is just a confusing mess.


** Given that the second Jerusalem Man novel involves time travel, and the third explicitly states that there is no time travel, only alternate reality travel, its not particularly surprising that he'd connect them all. Its all Atlantis' fault for ripping open the gates of reality in order to protect itself from nuclear missiles sent from the future, held in place by the magical field that ripped a hole in reality to prevent nuclear missiles from being sent back from the future. (This is actually a fairly concise description of the end of the second book)
*** ''[[FlatWhat What]]''.



** Seriously, the [[VirginNewAdventures New Adventures]] novel ''Damaged Goods'', which Davies wrote before being handed the series revival, has a scene near the end featuring a UNIT investigator with the same name as the protagonist of his earlier series ''DarkSeason''.



** Of course, in ''Planet of the Dead'' it's implied that Quatermass is fictional in the Whoniverse. [[TimeyWimeyBall Wibbly-wobbly, timey-wimey...]]. Mind you, Bernard could have just been a real hero as opposed to a fictional one of Malcolm.
*** The irony is that ''Quatermass'' creator Nigel Kneale always regarded ''DoctorWho'' as having ripped off all his ideas.
** Don't forget, BuffyTheVampireSlayer and Doctor Who most likely share a universe. Due to the huge pile-up of crossovers, as I said above, Ash from Evil Dead, Buffy, The Punisher and The Doctor could have to fight Lovecraftian horrors. Also, Batman and Aliens and Predators could show up, as could [[{{It}} Pennywise]].
*** There's also the Season 8 Buffy comic where the Tenth Doctor and Rose shows up in the background, making this a bit more canon...
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<<|Repair Shop Notification:xru1ehts1efj9l71lrzspxjv|>>

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Click the edit button to start this new page.

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-->''"They were independent, separate stories. But now...
the edit button stories are combining, that's why the worlds are becoming one."''\\
-- '''[[KamenRiderKiva Wataru Kurenai]]''', ''KamenRiderDecade''

[[SpeculativeFiction Sci-fi]] and fantasy authors don't always write all their novels in the same continuity. A budding new author's first published book might be about {{space pirate}}s in the 27th century, while his sophomore effort might instead be about 21st century scientists reverse-engineering a flying saucer. In response
to popular demand, he might end up writing a sequel to one, or even both of these novels. Flash forward about 20 years -- the author has grown wealthy from writing stories about Captain Flash Orangebeard and Dr. Smith of Mars, but he's running out of ideas and the two long-running series are in danger of getting stale. What does he do to keep the public's interest, and breathe new life into the storylines?

''A [[IntercontinuityCrossover Crossover]], of course!''

This is the tendency of long-lived genre authors to, at what is usually a later point in their career, combine two or more distinct series they've created into a single continuity. By combining the two series together, the author can introduce fans of one series to characters they may not be familiar with, inducing them to go out and buy the works in that series, and hopefully attract high sales from fans of both storylines. When done well, it can add a more epic feel to the tale, explore aspects of the two storylines not previously delved into, and make lots of money for the author and his publisher (and there are many examples of this, perhaps most famously ''{{Lord of the Rings}}''). When done poorly, especially with stories with radically different settings or styles, it looks and feels like a shallow money-grab and can potentially be a [[JumpTheShark shark-jumping]] moment for both series.

Whether it's an example of a well-done or a poorly-done crossover is a matter of contention. Not related to the ScunthorpeProblem.

ModularFranchise is when it's done at a corporate level.
----
!!Examples:

[[foldercontrol]]

[[folder:Cross-Media]]
* Chris Boucher's prose and audio official and semi-official spin-offs to ''DoctorWho'' and ''[=~Blake's Seven~=]'' strongly imply that they take place in the same universe, and more specifically that ''Blake's Seven'' takes place in the same geographical area and time period as Boucher's popular ''DoctorWho'' story "[[Recap/DoctorWhoS14E5TheRobotsOfDeath The Robots of Death]]". Fans disagree over whether they buy this.
* [[StElsewhere Tommy Westphall]]'s [[http://home.vicnet.net.au/~kwgow/crossovers.html mind]]. It's utterly insane. To recap: ''StElsewhere'' and ''[=~Homicide: Life On The Street~=]'', the cores of the mind, were respectively written and produced by Tom Fontana; the latter had a direct crossover with the former on two seperate occasions. Both shows also had crossovers with other shows (most notably ''Homicide'' with ''LawAndOrder'', whose producer Dick Wolf is a friend of Fontana's). Sound like a typical example of this trope, right? Well, then came the ''St. Elsewhere'' finale, [[AllThereIsToKnowABoutTheCryingGame revealing the entire series to be]] AllJustADream of minor character Tommy Westphall, effectively making ''Homicide'' and the other universes both shows crossed over with nothing but mere dreams as well! Needless to say, the fans started to compile and connect every ShoutOut to/in and crossover with anything remotely connected to these two shows, no matter how distant the links might be. It snowballed like the plague. Just for perspective, [[http://www.geekanerdblog.com/2009/06/det-munch-threat-to-multiverse.html the multiverse includes]] ''JohnMunch''.
* ''SuperRobotWars'' is already a crossover series, with nearly as many canons as it has games - most entries take place in their own continuities, created by fusing together the stories of whichever mecha shows are featured in that particular game. But there are a few characters who show up in multiple continuities, and while most of them are AlternateUniverse versions of each other, Gilliam Yeager, whose gimmick involves hopping between universes, has been implied to be the same person in all his appearances, no matter what continuity you're in. Which in turn means that any games with Gilliam in them would be part of the same {{multiverse}}. And then there's the ''EndlessFrontier'' series, which crosses over with both ''[[SuperRobotWarsOriginalGeneration Original Generation]]'' (which features Gilliam) and the even-more-mega-crossover ''NamcoXCapcom''. And since NamcoXCapcom contains everything from ''StreetFighter'' to ''{{Xenosaga}}'' to ''{{Klonoa}}'' (and if we want to logically extend this, also includes the ''[[CapcomVsWhatever Capcom VS.]]'' series and everything they include...) there are versions of all of those characters (not the same versions that exist in their original games, but still, ''a'' version) in the ''SRW'' multiverse. Eat your heart out, Westphail.
* The ''KamenRider'' franchise has had this going since the beginning. The Showa-era shows ([[Series/KamenRider original]] through ''KamenRiderBlackRX'') explicitly took place in the same universe, and the previous Riders would often show up near the end of the latest series to help out the current hero. The movies produced in the hiatus years (''ShinKamenRiderPrologue'', ''KamenRiderZO'', ''KamenRiderJ'') and the Heisei shows (''[[KamenRiderKuuga Kuuga]]'' to present) abandoned this, except for a few rare crossover events. ''KamenRiderDecade'' deliberately says that the Heisei shows all occupy their own separate universe... and then has the first nine (''Kuuga'' to ''[[KamenRiderKiva Kiva]]'') forcibly merged, with Decade forced to travel to alternate versions of said worlds in an attempt to fix everything... and then there's the ''Decade'' movie ''All Riders vs. Great Shocker'', which crosses over with the entire Showa-era universe as well. ''Movie War 2010'' also adds ''KamenRiderDouble'' to the mix. For extra humor, ''KamenRiderKabuto'' has a brief in-character cameo by the actor who plays Rider-1 in TheRemake ''[[KamenRiderTheFirst Kamen Rider THE FIRST]]''.
** ''MaskedRider'', the [[SoBadItsHorrible not well received]] American adaptation of ''Black RX'' was launched with a PoorlyDisguisedPilot in a ''MightyMorphinPowerRangers'' episode; much later, ''PowerRangersInSpace'' crossed over with ''TeenageMutantNinjaTurtles: The Next Mutation'', which makes all three American series share a Verse. All three are produced by Saban, which wasn't so bad back then, but as of 2009...
** ...it gets worse: Take the crossovers from the bullet point immediately above, put two plus two with the ''Kamen Rider'' and ''TMNT'' multiverses seperately etablished by ''Decade'' and ''TurtlesForever'' respectively[[hottip:* :Incidentally, both are 2009 anniversary specials.]], and toss in both the canonical ''SamuraiSentaiShinkenger'' arc of ''Decade'' and ''TeenageMutantNinjaTurtlesSmashUp'' for kicks. End result? ''Kamen Rider'', ''Power Rangers'', ''SuperSentai'', ''TMNT'', the ''UltraSeries'', and ''{{Rayman}}'' are all part of the ''Super Robot Wars'' canon. And that's not even the entire picture; read on.
* There have been countless''Transformers''/''GIJoe'' crossover comics and, even worse, the ''Transformers'' comic character Death's Head, who was then involuntarily sent to the ''DoctorWho'' universe (in the comics only) and then the MarvelUniverse, bringing things full circle... except that ''Who'' crossed over with not just ''Blake's Seven'' as mentioned above, but also SherlockHolmes '''and''' the CthulhuMythos in the DoctorWhoExpandedUniverse novel ''All-Consuming Fire'' and... '''[[PublicDomainCharacter for the sake of Primus, we better stop at Holmes and the Mythos or else this dysfunctional multiverse will be too big for this page...]]''' In fact, given that ''Doctor Who'' is also part of Westphall's mind, what we've got here is a truly dysfunctional mess of a multiverse, lest we forget that there is also existence of a what is most likely a [[http://img.photobucket.com/albums/v283/factorialinfinity/prlggallifrey.jpg Post-Time War Gallifrey]] in the Power Rangers Universe.
* Speaking of ''{{Transformers}}'', it was split from its very beginning into separate comic and cartoon continuities. However, this rapidly splintered further and further, with different comics in different continuities being introduced, anime series being created, the introduction of the ''BeastWars'' and ''BeastMachines'' ranges which combine elements from previous continuities, [[Film/{{Transformers}} the live-action movies]] and so on. In the mid-2000s, writer Simon Furman ruled that every single ''Transformers'' continuity forms part of a massive multiverse of different timelines, dimensions and universes, and sometimes featured crossovers in his stories (for example, the 'Generation One' Galvatron and several others making a cameo appearance in a ''TransformersArmada'' comic). He also ruled that Unicron and Primus are constant forces in this multiverse, and though they can be destroyed in one reality their consciousness lives on in another. Curiously, his next range of comics for IDW seemed to separate from this idea altogether.
** The canonical explanation of how Multiversal Singularities work, using [[Film/{{Transformers}} The Fallen]] as an example, [[MindScrew truly has to be read]] [[VoodooShark to be believed.]] [[http://tfwiki.net/wiki/Multiversal_singularity Link.]]
* Virtually everything in Dozerfleet Comics will eventually end up in either the [[CiemWebcomicSeries Gerosha universe]] or the [[StationeryVoyagers Voyager universe]], usually the former. That means that [[HalfHumanHybrid Candi Levens]] [[FantasyKitchenSink shares a universe]] with [[ChaoticGood Navyrope]], [[EmotionEater Extirpon]], [[DeterminedWidow Jessie]] [[TakeUpMySword Morcin]] of ''Kozerlen'', [[MaskedRider Prince]] [[TheFrogPrince Volkonir]] [[InTheNameOfTheMoon the Cortatian]], and [[BackupTwin Aaron Stefflin]] of ''[[http://dozerfleetwiki2.wiki-site.com/index.php/Blood_Over_Water Blood Over Water]]''. And even [[TheRing Mr. Each-Frame-Is-A-Week]] himself [[EldritchAbomination Marzwhatti the Lirquinwir]].
** That's not even counting [[WickedWitch Meshaluta]] from ''[[http://dozerfleetwiki2.wiki-site.com/index.php/90_Has_No_Secant 90 Has No Secant]]''.
[[/folder]]

[[folder:Anime and Manga]]
* Manga creator GoNagai does this often with his various works, although ''MazingerZ'' and ''Grendizer'' were already part of one continuity from Grendizer's get-go.
** ShinMazinger is quickly reaching a critical level of this, with a woman from ''Violence Jack'' turning out to be [[spoiler: Kouji Kabuto's ''mother''.]]
* Gosho Aoyama's three main works ''DetectiveConan'', ''MagicKaito'', and ''{{Yaiba}}!'', have the tendency to merge into one universe. ''MagicKaito'' was more or less put on hold in favor of ''DetectiveConan'', but its characters occur so frequently in ''DetectiveConan'' to be characters the latter's recurring characters. Although, Aoyama also drew the line: ''DetectiveConan'' does not deal with the daily life of the ''MagicKaito'' characters.
** On the other hand, ''MagicKaito'' is definitively ''in'' the same universe of ''{{Yaiba}}!''; the characters went to the same school called Ekoda, and the ''DetectiveConan'' OVA Conan vs Kaitou Kid vs Yaiba was originally a ''MagicKaito'' story arc (and not JustADream), in which Kaito attempts to steal a magic sword, just before he found out what he was meant to be going after. Not to say, Aoko's gossip mill friend Keiko's "very reliable source" is Sayako, the main girl in ''{{Yaiba}}!''.
* ''TurnAGundam'' broadly hinted that each of the different [[AlternateContinuity Alternate Continuities]] of the ''{{Gundam}}'' [[{{Ficton}} franchise]] to date were part of a grander history -- with plenty of [[TheEndOfTheWorldAsWeKnowIt disasters]] to [[AfterTheEnd reset the clock]] between settings.
* The mangaka group {{CLAMP}} has been known for self-crossovers for many years, but their twin series ''TsubasaReservoirChronicle'' and ''{{XXXHolic}}'' are meant to tie all their works--both present-day and fantasy--into a single continuity.
* ''PrettyCure. All Stars.'' 14 magical girls from 4 different continuities save the day. Awesome.
** The second All Stars-movie features 17 magical girls from 5 different continuities. From the previews it seems to feature some of the different baddies, too.
* Eiichiro Oda re-used Ryuuma, a character from his one-shot manga ''Monsters'', as a (zombified) villain in ''OnePiece'' and his home country was mentioned to be part of the New World (the second half of the Grand Line). He later confirmed that ''Monsters'' was incorporated into the backstory of the setting.
* ''MahouSenseiNegima'' reveals that all of Ken Akamatsu's major works exist in the same universe. The ties between Negima and ''LoveHina'' are obvious with Setsuna being a Shinmeiryuu swordswoman, which is lead by the Aoyama family from ''Love Hina''; the reference to ''AILoveYou'' is found in a single panel, although it's kinda important, as [[spoiler: the protagonist of that series is implied to have written the code that enables [[RobotGirl Chachamaru]] to have a soul.]]
* Before he gave the world ''{{Dragon Ball}}'', AkiraToriyama's first popular series was a comedy called ''DoctorSlump'', about a robot girl and the slob scientist who created her causing havock in a weird place called Penguin Village. About a year into ''Dragon Ball'', Toriyama had Goku visit Penguin Village and meet most of the ''Slump'' cast, thus joining the two series into one universe.
** This was mostly done as an attempt to use ''Dr. Slump''[='=]s popularity to help increase readership of ''Dragon Ball'', as it wasn't the huge hit it would eventually become yet. Ironically, in later years the crossover has had the opposite effect: many fans, especially outside of Japan, only know the ''Dr. Slump'' cast because of their guest spot on ''Dragon Ball''.
*** It's gotten to the point that Arale's made it into at least two Dragon Ball video games as a playable character! Budokai Tenkaichi 3 and Origins, to be precise.
* The canons of {{Tsukihime}}, FateStayNight, and KaraNoKyoukai (plus others) are generally grouped together and called the NasuVerse. There's rarely direct crossover of the characters, except in [[BattleMoonWars spin-off]] [[MeltyBlood games]] and non-canon side-comics. WordOfGod on each canon's characters respective power levels in relation to each other ([[MemeticMutation can Shiki kill Servants?]]) is [[FlipFlopOfGod conflicting]].
* LeijiMatsumoto is notorious for this, with ''GalaxyExpress999'', ''CaptainHarlock'', ''QueenMillennium'', and ''SpaceCruiserYamato'' crossing over to various degrees, not always following a consistent continuity.
[[/folder]]

[[folder:Comic Books]]
* JackKirby is the TropeCodifier.
* The [[TheDCU DC]] and [[MarvelUniverse Marvel]] universes were born from this trope; originally, the titles published by each company did not overlap, but over time, cameos, {{Crossover}}s, and inside references combined to form the comic books into one big, interconnected web.
** And then there's the Amalgam universe...
** Mind, Marvel started this within the first ten issues of ''SpiderMan''...
*** Technically, Marvel (or more accurately, Marvel's prior incarnation as Timely Comics) started this 21 years earlier, than that, when Human Torch faced off against Namor the Submariner for the first time. They teamed a few more times over the next few years, and some of the less prominent characters occasionally got involved. Then, in 1946, Timely launched the All-Winners Squad, teaming up existing characters like Captain America, the Human Torch, and the Sub-Mariner (among others)
** DC started it twenty years earlier in All-Star Comics #3 with the Justice Society's first meeting.
*** To this day, it's generally accepted that the Justice Society is the first-ever example of a super hero team in comics history.
**** Or, at least, the first superhero team that stayed together for more then one issue.
** DC has also historically made a habit of assimilating the characters of other comics companies into their multiverse - National Comics (Uncle Sam and Freedom Fighters), Fawcett Comics (Shazam, Captain Marvel and the Marvel Family), Charlton Comics (Captain Atom, Blue Beetle, the Question), WildStorm Comics (the Authority, WildCATS), Milestone Comics (Icon, Hardware, etc) and most recently, Archie Comics' Red Circle superhero characters. Generally, these characters
start off in alternate timelines, and then some sort of universal crisis reboots the DC Universe yet again, merging the timelines. Of the six companies listed here, only the WildStorm Universe still survives as a separate timeline in 2010.
* Characters from Jay Faerber's creator-owned series (''NobleCauses'', ''Venture'', ''Firebirds'', & ''{{Dynamo 5}}'') appear in each other's books all the time, creating a loose-knit "Faerberverse".
** Robert Kirkman's characters occasionally cross over in a similar fashion (and some times become supporting cast - especially in ''{{Invincible}}'').
*** The Kirkmanverse and Faerberverse intersect at a number of points, especially The Pact mini-series. Other Image characters, such as SavageDragon and {{Shadowhawk}}, often pop up. So far, however, {{Spawn}} had yet to make an appearance...
*** ... Until the recently announced ''Image United'', which will crossover everything in Image by Erik Larsen, Rob Liefeld, Todd [=McFarlane=], Whilce Portacio, Marc Silvestri, Robert Kirkman, and Jim Valentino.
* Eclipse Comics' four-part crossover mini-series, ''Total Eclipse'' brought together virtually all company-owned and creator-owned characters that the company published.
* The ''Harlem Heroes'' strip in ''[=~2000AD~=]'' (about a basketball team with jetpacks in 2050) appeared to be totally unconnected to the 22nd centuy of the ''JudgeDredd'' universe until the son of one of the Heroes (John "Giant" Clay) joined the Judges (as Judge Giant). The ''JudgeDredd'' story "Hammerstein" suggested ''ABC Warriors'' was also set in the past of the Dreddverse, but later ''ABC Warriors'' stories contradicted this.
** Dredd has also had crossovers with other ''2000AD'' strips whenever the writers felt like it, most notably ''StrontiumDog'' and the story Helter Skelter (where GarthEnnis basically crossed ALL his favourite strips over with Dredd).
** Meanwhile, ''2000 AD'' stalwart Pat Mills has crossed over ''everything he's ever written for 2000 AD'' with each other. Invasion!/Savage, Flesh, Ro-Busters, ABC Warriors, and NemesisTheWarlock all slot together.
** Ian Edginton does the same thing with his ''2000 AD'' strips: both ''Stickleback'' and ''The Red Seas'' share a secret organisation, ''The Red Seas'' and ''Defoe'' share an apparently immortal Isaac Newton, little mentions and character cameos abound, and the same brand of EldritchHorror appears in ''Stickleback'', ''Ampney Crucis Investigates'', and arguably ''Detonator X''.
* AlanMoore, as time has gone on, has turned ''LeagueOfExtraordinaryGentlemen'' into this, making vague references to the source material for Ozymandias and the Black Freighter. Oh, sure, it's only references to the inspirations for them, and Moore would probably rather have his skin boiled then actually go further then that, but
this is AlanMoore, ''there are no coincidences''.
** That's a bit of an odd example, since the League already existed in a world where [[AllMythsAreTrue All]], and we mean really [[AllMythsAreTrue All, Myths Are True]]. Volumes one and two of the ''LeagueOfExtraordinaryGentlemen'' comics were entirely populated by {{Historical Domain Character}}s, so a few characters created by the author is only a very small step further.
** As an aside, Moore is a close friend to Moorcock, close enough that Moorcock has allowed Moore to put in some Moorcock characters into the ''League'' series free of charge.
* [[FrankMiller Frank Miller's]] {{Batman}} stories: ''TheDarkKnightReturns,'' ''BatmanYearOne,'' ''TheDarkKnightStrikesAgain,'' and ''[[AllStarDCComics All-Star Batman and Robin]]'' were originally supposed to be in separate universes, with only ''TheDarkKnightReturns'' and ''TheDarkKnightStrikesAgain'' having any clear continuity with each other. With the restoration of the DC [[TheMultiverse Multiverse,]] all of the FrankMiller-penned Batman stories are now set in Earth-31, which makes ''Year One'' unique in being canon to both Earth-31 and the main DCU.
* [[http://www.bleedingcool.com/2009/10/01/the-mark-millar-tie-up-athon-spoilers/ This article]] suggests that all of [[MarkMillar Mark Millar]]'s recent Marvel work (''1985'', ''FantasticFour'', ''KickAss'', and ''[[{{Wolverine}} Old Man Logan]]'') is all interconnected.
* DCComics'
new page. [[TheMultiverse Multiverse]] includes many universes that used to be considered non-canon {{Elseworld}} stories, such as ''SupermanRedSon'', ''KingdomCome'', and even ''BatmanBeyond'' (and the rest of the DCAU by extension). This allowed for some interesting crossovers, such as when Earth-22 (KingdomCome) Superman teamed up with the [[JusticeSocietyOfAmerica Justice Society]] of the main DC Earth.
** Not necessarily the entire DCAU. The Terry McGinnis Batman of the DC Multiverse (and the history of his Earth) doesn't have to correspond to the details of the ''Batman Beyond'' cartoon any more than the Bruce Wayne Batman of the main DCU corresponds to the details of ''Batman: The Animated Series.''
* GrantMorrison's ''{{All Star|DC Comics}} Superman'' and ''DCOneMillion'' seemed to be tied in the same continuity and WordOfGod says that it might be tied with ''All Star Batman and Robin the Boy Wonder''.
** Of course, GrantMorrison is one of the architects of [[http://www.hyperborea.org/flash/hypertime.html Hypertime]] (the other being Mark Waid) which posits that it is all true. Under this concept, the events of ''DC vs. Marvel'' exists somewhere in continuity.
* When Semic Comics, a French comic publisher, decided to revive the characters it inherited from defunct ''Editions Lug'', editor Jean-Marc Lofficier set out to link over 2000 largely unrelated characters from just about every comic book genre into a single continuity. Some characters had to be revamp fairly drastically to fit in, and a few had to be revamped to avoid duplication.
[[/folder]]

[[folder:Literature]]
* Fantasy author MichaelMoorcock gradually connected almost every single character he'd created into a MythArc revolving around the concept of the [[CosmicPlaything Eternal Champion]].
* {{Robin Hood}} and {{Maid Marian}} stem from seperate traditions and were hooked up around the 16th century.
* Beginning with ''{{It}}'', StephenKing began tying many of his novels into ''TheDarkTower'' series, to the point that almost every single novel he wrote during the early 2000s was somehow related to the epic. The process included bringing back a character he PutOnABus (literally) in '''[=~'Salem's Lot~=]'' and {{retcon}}ning the BigBad from ''TheStand'' into the Crimson King's [[TheDragon Dragon]]. (Indeed, the Crimson King himself made his first appearance outside the Dark Tower series.)
** Not "almost". From ''Desperation'' (1996) to ''From a Buick 8'' and ''Everything's Eventual'' (2002), 100% of King's fiction output (six novels and two story collections) tied into ''TheDarkTower'' (at least retroactively). These were bookended by "WizardAndGlass" in 1997 and the conclusion of the Dark Tower series in 2003-04. Plus the aforementioned incorporation of everything back to ''Salem's Lot'' and ''TheStand'', written before ''TheGunslinger''.
** And lest we forget, '''Salem's Lot'' takes place in the same city as ''Jerusalem's Lot'', an earlier short story, confirmed to be in the CthulhuMythos. Therefore, ''The Dark Tower'' series is part of the Mythos by extension. Which also makes it part of the above ''SuperRobotWars'' clusterfuck by extension-extension.
** It's also been established that if there's anyone in a King story with the initials R.F., they're probably a very particular person: [[spoiler: Randall Flagg, the {{Big Bad}} of ''TheStand'', The Eyes of the Dragon (as Flagg, no first name), and the Crimson King's [[TheDragon Dragon]].]]
*** Except for Rudy Foggia of ''The Jaunt'', who is quite dead at the beginning of the story.
** ''{{It}}'' also contains an appearance by Charles Pickman, from the HPLovecraft story ''Pickman's Model'' - which ties it to all the Lovecraft stories mentioned below. King's next novel, ''TheTommyknockers'', not only crossed over with ''It'', but also tied in several of King's other novels, including ''Firestarter'' and ''TheTalisman''.
*** Also, the books Dolores Claibourn and Gerald's Game refer to each other as the female protagonists of the books have a psychic link, having times when they suddenly get the feeling that this other person, who they don't know, is somehow in danger.
* In the 1980s, IsaacAsimov wrote a series of novels that linked his ''Robots'', ''Empire'', and ''{{Foundation}}'' novels into a single continuity. He also even went so far as to in ''Foundation and Earth'' suggest (via throwaway reference in dialogue) a tenuous connection between the Robots/Empire/Foundation series and an otherwise seemingly unrelated, comparatively obscure time-travel novel, ''EndOfEternity'', which he wrote in the 1950s (interestingly enough, if they ''were'' in the same continuity, the end of the novel would effectively have caused the ''entirety of the events in the rest of the series'', because said ending [[spoiler:revolves partly around allowing humanity to expand into space instead of mouldering on Earth]]).
** Don't forget throwing in a reference to his standalone novel Nemesis in one of the later Foundation books, despite the fact that Nemesis and the Robots/Empire/Foundation books taking place in the same universe makes no sense whatsoever (not even the space-travel physics work the same way).
*** That may have literally been a reference to his ''novel''.
** The FanSequel, ''Psychohistorical Crisis'' {{retcon}}s a number of aspects of the Foundation series, and also ties in Asimov's otherwise unrelated ''Nightfall'' short story.
* The final novels in AnneRice's ''Vampire Chronicles'' tie Lestat's story into that of the Mayfair witches.
* [[JRRTolkien J.R.R. Tolkien's]] ''TheHobbit'' was not, at the time of its writing, intended to be in the same continuity as ''TheSilmarillion'', which Tolkien regarded mainly as personal recreation and had no intent of publishing. Despite this, he couldn't help throwing in a few [[ShoutOut names and locations]] that referenced the Silmarillion. When he began writing the sequel that would become ''TheLordOfTheRings'', he went whole-hog and moved ''The Hobbit'' to Middle-Earth, the Silmarillion becoming the BackStory of the novels. This is perhaps why Hobbits are the one species whose origin isn't detailed in the Silmarillion.
** Also worth noting is that Tom Bombadil, Goldberry and Old Man Willow originally appeared in a poem published in 1933. They had no connection to Middle-Earth until the writing of ''TheLordOfTheRings'' was in progress, and that didn't turn them into anything more significant than a WackyWaysideTribe.
* RobertAHeinlein did this towards the end of his career, incorporating all his previous stories (often with radically different universes) into one meta-universe, thanks to a handy trans-dimensional device invented by one of his characters. Then he brought the ''John Carter of Mars'' series in, and the [[TheWonderfulWizardOfOZ Oz books]], and eventually ''all fiction ever created''.
** Though he did give preference to the ones he liked, and especially those written by authors with whom he was personally acquainted; one of the transdimensional 'jumps' involved taking the characters into the {{Lensman}} universe created by his friend, E.E. "Doc" Smith.
** It's worth noting that nearly all main characters he ever wrote are in one scene at the end of ''A Cat Who Walks Through Walls''. It involves most of them trying to recover Mycroft Holmes, whose death was perhaps the biggest TearJerker he ever wrote. Towards the end the characters are aware they are in a story, and find the Author to be a bastard...
* LarryNiven combined many of his earlier short stories into the back history of his ''KnownSpace'' series. The merge happened relatively early in his writing career, but they weren't intended to be the same universe when written.
* The first novel in TerryPratchett's NomesTrilogy, ''Truckers'', takes place in the (real) town of Grimethorpe, but in the later books the Store is relocated to Blackbury, which is also the setting of the JohnnyMaxwellTrilogy.
* EdgarRiceBurroughs did this when ''{{Tarzan}}'' first traveled to the underground world of Pelucidar to rescue that title's hero. It grew from there under his pen and under the pen of others using his characters.
** There was a series of action figures: "Tarzan on Mars". Of course, poor Edgar had nothing to do with it.
** In ''A Fighting Man of Mars'', Jason Gridley appears. Since Gridley met Tarzan in Tarzan At the Earth's Core, a Pellucidar novel, this links Tarzan, Barsoom, and Pellucidar.
*** Gridley is also mentioned in the Amtor (Venus) series, linking those five books as well.
*** Tarzan is mentioned by the narrator as having participated in some historical event prior to the main story of the first story. Even then, the Tarzan books, and by association, everything Tarzan had appeared in, were part of the Amtor universe within the first twenty five pages of Pirates of Venus.
**** Also, the technology for the Moon mission from ''The Moon Men'' was Barsoomian in origin.
* Terry Brooks' ''{{Shannara}}'' series was always established as being set a fantasy world that formed AfterTheEnd of modern civilisation. The ''Genesis of Shannara'' series is set during the collapse of civilisation, and establishes the past of the Four Lands as the UrbanFantasy setting of his ''The Word And The Void'' novels.
** Not that there hadn't been minor hints throughout.
* HPLovecraft's story ''The Dream-Quest of Unknown Kadath'' ties most of his early standalone [[ShortStory short stories]] into the Dreamlands Cycle, and also brings in ''Pickman's Model'' and the Randolph Carter stories. At the end, the Dreamlands Cycle is linked to the CthulhuMythos, though a few stories (such as the early "Dagon") ''may'' be outside the grand continuity. Several other authors have expanded this, notably August Derleth and {{Clark Ashton Smith}}.
** Lovecraft also has a bit of a habit of tying his stories together by simply referencing passages from the Necronomicon, other forbidden books, or placing offhand comments during the expository monologues, about various {{Eldritch Abomination}}s that have no bearing on the current story.
*** Cthulhu, Azathoth, and Yog Sothoth are mentioned this way all the time.
*** Even the weird demonesque race beneath the Earth from "The Rats in the Walls" seems to be referenced in "The Whisperer in Darkness" despite seeming to be completely unrelated.
* Tony Hillerman once had two series, one featuring Navajo cop Jim Chee and one featuring Navajo cop Joe Leaphorn. There is now only the Leaphorn & Chee Mysteries.
* First ''The Poet'' and ''Blood Work'' got sucked into Michael Connelly's Harry Bosch universe, now ''Void Moon'' has been caught in the gravity well, too. Of course, unlike many of the other entries here, Harry Bosch's "world" is that of LAPD Homicide, and so referencing or including a few of Michael Connelly's stand alone novels doesn't really require much in the way of a RetCon.
* Before he's done, F. Paul Wilson's ''Adversary Cycle'' bids fair to weave in practically every book and short story the man has ever written.
* MercedesLackey's assorted UrbanFantasy stories seem to be set in different continuities, until mention is made of the west coast elfhames (from the ''Bedlam's Bard'' series) in the [=SERRAted=] Edge novels, and of Tannim, the mulleted protagonist of the [=SERRAted=] Edge novels appearing as a bit character in his teens in ''Jinx High'', a Diana Tregarde investigation.
** Since ''Jinx High'' was Tannim's first appearance, and the ''Bedlam's Bard'' events were namechecked in the first [=SERRAted=] Edge novel, this one was evidently intended from the start, or nearly so.
* Kate Elliott has confirmed that her new ''Crossroads'' trilogy of fantasy novels is actually a fictional story within the context of her earlier ''Jaran'' series of SF novels.
* Peter F. Hamilton retconned several of his earlier SF short stories to be set in the same universe as his immense, later ''Night's Dawn Trilogy'' and published them in a collection called ''A Second Chance at Eden''. However, he has avoided this phenomenon elsewhere and has created no less than three distinct SF universes existed at similar points in history, making it impossible for them to coexist in the same continuity.
* AlastairReynolds did something similar with several of his early SF short stories, retrofitting them into his ''Revelation Space'' series of books and publishing the results as a collection called ''Galactic North''.
* {{Guy Gavriel Kay}}'s ''[[TheFionavarTapestry Fionavar Tapestry]]'' trilogy presents the world of Fionavar as so significant that echoes of it appear in the mythologies of every other world in TheMultiverse. His subsequent stand-alone novels ''{{Tigana}}'' and ''A Song for Arbonne'', although each set in a different world, each has a moment showing that to be true. ''Ysabel'' is more overt, actually featuring several characters from the ''Fionavar Tapestry'' later on.
* GeorgeRRMartin once claimed that he had come up with the ideal way to end ''{{A Song of Ice and Fire}}'': the superheroes of his ''WildCards'' stories would arrive via transdimensional portal and sort everything out. Luckily, he was joking. However the re-use of many names and ideas from his early SF ''Thousand Worlds'' setting has been used by some fans to theorise an SF explanation for many of the events in the series, despite GRRM's denial of it.
** In his commentary found in the ''Dreamsongs'' collection, Martin explicitly says that it is a bad idea to retroactively try to link one's stories together. He notes that he could have attempted to tie his "Star Ring" stories into his ''Thousand Worlds'' future history, but he didn't.
* The Peter David novel ''Howling Mad'' mentions Mayor Penn, who is the returned King Arthur from ''Knight Life''.
* Brandon Sanderson has recently said that his novels all belong in the same multiverse.
** Here we can get a lot of EpilepticTrees when he ghostwrites the end of the ''{{Wheel of Time}}'' Series.
*** Despite the fact that he specifically excluded the Wheel of Time books when he stated as such.
* A particularly confusing example is ''The Well of Lost Plots'', which ties the world of ''ThursdayNext'' into a book ([[NurseryCrime now a series]]) that Jasper Fforde wrote ''first'', but which was published ''afterwards'' (''The Big Over Easy'', originally ''Nursery Crimes''), and does so by establishing it as fictional within the Nextiverse, although, like all works of fiction, Thursday can enter it, and spends most of the book inside it, being ultimately responsible for its odd mix of genres. Everyone follow that?
** To further confuse things, the ''Thursday Next'' stories are themselves fictional within the ''Nursery Crimes'' series.
* AgathaChristie's AuthorAvatar Ariadne Oliver seems to tie several of her series together. She originally appeared in the Parker Pyne stories (as did Miss Lemon). Then she became established as a HerculePoirot character, starting with ''Cards On The Table'' (which also featured Superintendent Battle, who'd previously appeared in the two novels starring Bundle Brent). Then she was the main character in the 1961 novel ''The Pale Horse'', which also featured the vicar's wife from the MissMarple novel ''The Moving Finger''. And in ''Murder In Three Acts'', Poirot meets Mr Satterthwaite, who previously appeared in ''The Mysterious Mr Quin'' collection of short stories. Tommy and Tuppence are the exception; in ''Partners In Crime'', they specifically refer to Poirot as a fictional character.
** Which leaves the question of why the same slightly unhinged old lady appears in ''The Pale Horse'' (okay, just mentioned), MissMarple novel ''The Sleeping Murder'', and the Tommy and Tuppence novel ''By the Pricking of my Thumbs''...
** Tommy and Tuppence can be linked to the others through a mysterious character who is only referred to as Mr. Robinson. This character appears with Poirot in ''Cat Among the Pigeons'', Marple in ''At Bertram's Hotel'', and Tommy and Tuppence in ''Postern of Fate''. He also appears in ''Passenger to Frankfurt'', which does not feature any of Christie's series detectives.
* While KimNewman has seeded connections between his books since the beginning, the short story "Cold Snap" seems to be a concentrated effort to tie them ''all'' together. A "Diogenes Club" story (and therefore featuring characters whose AlternateUniverse selves appear in the ''Anno Dracula'' novels) it adds characters from his early work such as ''Jago'', and even features the villain from his ''DoctorWho'' novella ''Time And Relative''.
** Newman isn't the only author to tie his personal {{Verse}} into the {{Whoniverse}}. Iris Wildthyme was a character in Paul Magrs' MagicRealism novels, before he revealed she was an extremely eccentric Time Lady.
** Under the pseudonym Jack Yeovil, Newman wrote a number of books based on Games Workshop properties. Comeback Tour, one of the ''Dark Future'' books, stated that the BigBad was the same guy as the Big Bad from his Vampire Guinevere series of ''Warhammer'' books.
* [=~H. Rider Haggard~=]'s novel ''She and Allan'' brought together Ayesha from ''She'' and Allan Quatermain from ''King Solomon's Mines''.
* E.E. "Doc" Smith's ''{{Lensman}}'' series of novels was originally 4 books long (initially published in serial form in an SF magazine). In the late 1940s or early 1950s, he took an early work of his named ''Triplanetary'' and retrofit it in with the rest of the ''{{Lensman}}'' universe. He wrote an additional novel, ''First Lensman'', to bridge the gap between the two storylines.
* ''{{Jules Verne}}'' connected ''The Mysterious Island'' with his earlier books ''{{Twenty Thousand Leagues Under the Sea}}'' and ''In Search of the Castaways'' by adding Captain Nemo from the former and Tom Ayrton from the latter to the cast of characters, however it opened a few [[PlotHole plot holes]] not to mention that the time period doesn't match.
* DavidGemmell has stated that all his books take place in the same world, deespite covering vastly different territory, such as a low-magic fairly standard fantasy world (''DrenaiTales''), a post-apocalyptic world (''The Jerusalem Man'') and our own world (an Arthurian duology and a duology set in ancient Greece).
** Given that the second Jerusalem Man novel involves time travel, and the third explicitly states that there is no time travel, only alternate reality travel, its not particularly surprising that he'd connect them all. Its all Atlantis' fault for ripping open the gates of reality in order to protect itself from nuclear missiles sent from the future, held in place by the magical field that ripped a hole in reality to prevent nuclear missiles from being sent back from the future. (This is actually a fairly concise description of the end of the second book)
*** ''[[FlatWhat What]]''.
* L. Frank Baum, the author of ''TheWonderfulWizardOfOz'', also wrote Oz sequels and non-Oz works of fantasy. Through several {{Crossover}}s, he established that all of them take place in the same magical continent, called Nonestica.
* Irvine Welsh combines characters from the book ''{{Trainspotting}}'' with characters from one of his lesser (Read: Hasn't been made into a film with someone who later starred in ''StarWars'') known works, Glue, into Trainspotting's sequel [[BetterThanItSounds Porno]].
** Doesn't count, because Trainspotting and Glue already shared several characters, and have always been explicitly intended to take place in the same continuity.
* The ninth FightingFantasy gamebook, ''Caverns of the Snow Witch'', took the player on a tour of all the major locations from the previous eight books, establishing that they all took place in the same land of Allansia. The monster manual ''Out of the Pit'' then expanded this world: Allansia and The Old World, the setting for the ''Sourcery'' series of gamebooks, were two continents on the world of Titan.
* Many, if not ''all'', of the books written by TedDekker are in the same continuity, as one book references characters from seemingly unrelated books.
* Leslie Charteris introduced Inspector Teal in the novel Daredevil featuring Storm Arden before Teal appeared in the Saint series.
* PoulAnderson's Nicholas van Rijn stories and Dominic Flandry stories weren't, originally, part of the same universe. But a bit of prodding by fans, and he wrote some bridging so that now they are.
* DaleBrown has done this. Rebecca Furness and Daren Mace, characters originally in the non-Patrick [=McLanahan=] book ''Chains of Command'', joined the main continuity in ''Battle Born'' and ''Warrior Class'' respectively. The eponymous space station of ''Silver Tower'', thought a victim of CanonDiscontinuity because of its long absence from his books, joins the main continuity in ''Strike Force''. TheDragon of non-Patrick [=McLanahan=] book ''Storming Heaven'', Gregory Townsend, is DragonAscendant BigBad of main continuity title ''The Tin Man''.
* Partially subverted by KurtVonnegut. While many of his characters appear in multiple novels, the Tralfamadorians are different in every novel in which they appear.
* Iain Banks, in his mainstream literature (non-SF, Culture etc.) has said he doesn't do sequels/prequels; though he did include one subtle crossover in ''Complicity'': Cameron's friend Al, an engineer he met on a paintballing weekend, is Alexander Lennox, recovered from his car-crash in ''The Bridge''.
* Rick Riordan's new series ''TheKaneChronicles'' is already shaping up to be this way. One book into the series and its already filled to the brim with ShoutOuts and subtle references to Riordan's other series, PercyJacksonAndTheOlympians, without WordOfGod confirming them to be in the same continuity. Also take into account that Poseidon in the Percy Jackson series has made mention of other gods (though in this case the Norse ones) before. This troper's going to [[WildMassGuessing go ahead and take a guess that they eventually will be revealed to be in the same continuity]].
* All of Christopher Moore's varied books appear to take place in the same verse, whether the setting is modern suburbian California or Israel in Jesus' time. Various characters make appearances outside of their respective novels, like angels and vampires and fruit bats.
* Philip Jose Farmer took this to the extreme in his creation of the {{Wold Newton Universe}}. His novels ''Tarzan Alive'' and ''Doc Savage: His Apocalyptic Life'' link the two heroes' respective families to the same event, the meteor strike in Wold Newton, Yorkshire, England, on December 13, 1795. Other stories, both by Farmer and other writers, have expanded the Wold Newton universe to demonstrate links to the Scarlet Pimpernel, Sherlock Holmes, the Spider, James Bond, Nero Wolfe, Sam Spade, the Lone Ranger, the Green Hornet, and even {{Star Trek}}.
* Madeleine L'Engle first connected her "Kairos" and "Cronos" series when Canon Tallis from Kairos novel ''The Arms of the Starfish'' appears in Cronos novel ''The Young Unicorns''; several characters from each series would cross over later.
[[/folder]]

[[folder:Live Action TV]]
* RussellTDavies has suggested that Adam Mitchell's mum in ''DoctorWho'', played by Judy Holt, may be the same person as Sister Mitchell in ''ChildrensWard'', also played by Judy Holt, which would bring RTD's earlier programme into the {{Whoniverse}}. He was ''probably'' joking.
** Seriously, the [[VirginNewAdventures New Adventures]] novel ''Damaged Goods'', which Davies wrote before being handed the series revival, has a scene near the end featuring a UNIT investigator with the same name as the protagonist of his earlier series ''DarkSeason''.
** Doctor Who has also crossed over with ''{{Quatermass}}'', thanks to both being BBC creations and seminal British sci-fi. It started with a jokey reference to Quatermass' British Rocket Group in "Remembrance of the Daleks", then the tie-in books made it explicit (with Quatermass ''turning up'' in one)...
** Of course, in ''Planet of the Dead'' it's implied that Quatermass is fictional in the Whoniverse. [[TimeyWimeyBall Wibbly-wobbly, timey-wimey...]]. Mind you, Bernard could have just been a real hero as opposed to a fictional one of Malcolm.
*** The irony is that ''Quatermass'' creator Nigel Kneale always regarded ''DoctorWho'' as having ripped off all his ideas.
** Don't forget, BuffyTheVampireSlayer and Doctor Who most likely share a universe. Due to the huge pile-up of crossovers, as I said above, Ash from Evil Dead, Buffy, The Punisher and The Doctor could have to fight Lovecraftian horrors. Also, Batman and Aliens and Predators could show up, as could [[{{It}} Pennywise]].
*** There's also the Season 8 Buffy comic where the Tenth Doctor and Rose shows up in the background, making this a bit more canon...
* Rumors abound to this day that Patrick [=McGoohan=]'s Number 6 from ''ThePrisoner'' is the same character as John Drake, his role in the earlier series ''DangerMan''. [=McGoohan=] always denied it while other people involved in the show supported it, in what was probably a deliberate attempt to screw with the fans some more.
** It's been suggested that [=McGoohan=] tended to deny it solely because he didn't hold the rights to his previous role, and thus, establishing a direct connection could be considered copyright infringement (and thus, potentially actionable). His co-writer on the series has always claimed that it was definitely Drake, though.
* Although the Showtime revival of ''TheOuterLimits'' was an anthology show, it usually ended its seasons with money-saving clip shows tying multiple prior episodes together into a single continuity.
* ''PowerRangers'' has gone through this a few times. While the first six seasons were all one storyline and the seventh (''PowerRangersLostGalaxy'') was a direct sequel, each one past that has been self-contained. Some make references in their premieres to the concept of Power Rangers already existing, but others have to wait until a late-season crossover with the previous team for those links to be forged. Two notable occasions are when ''PowerRangersLightspeedRescue'' crossed over with ''PowerRangersLostGalaxy'', retconning the latter from TwentyMinutesIntoTheFuture to the present day; and ''PowerRangersDinoThunder''[='s=] establishing the previously-unlinked ''PowerRangersNinjaStorm'' season as part of the universe.
* The Disney Channel has done several crossovers with their live action series, so that [[ThatsSoRaven psychics]], [[WizardsOfWaverlyPlace witches]], and [[TheSuiteLifeOfZackAndCody The Tipton Hotel]] now exist in the same world as HannahMontana.
* It's been more-or-less established that all Nickelodeon sitcoms beginning with Drake&Josh all take place in the same universe. This does raise interesting questions when DrakeBell (and not his ''D&J'' counterpart Drake Parker) appears on a first season episode of Zoey101.
[[/folder]]

[[folder:Tabletop RPG]]
* An odd version of this exists in ''DungeonsAndDragons''. Gods cross over from one campaign setting to another, spells exist under different names, and so on.
** Spells ''also'' exist under the '''same''' names.
** The ''{{Planescape}}'' and ''{{Spelljammer}}'' meta-settings provided a mechanism for crossing over between published campaign worlds. ''Spelljammer'' showed that they most of them existed in different solar systems of the Prime Material Plane, encased in crystal spheres, and one could travel between them in skyships called spelljammers. ''Planescape'' takes place mostly in the Outer Planes, but allows for portals to any Prime Material Plane world.
** There was also the [[InnBetweenTheWorlds World Serpent Inn]], which even links campaign settings which are explicitly not part of the Planescape/Spelljammer cosmology, such as ''{{Eberron}}''.
* The old ''WorldOfDarkness'' was originally a set of unrelated {{tabletop RPG}}s which shared the same basic gameplay. Then White Wolf decided to link them all together, with rather strange results. While werewolves could reasonably fit into the same setting as vampires or mages, trying to jam vampires and mages into the same setting was a trick endeavour, given that both groups were said to have been secretly manipulating human history since the dawn of time. The new version is made with the possibility of such crossovers explicitly in mind, at the same time keeping each group at arms length - the storyteller is not required to have them all exist if she or he doesn't want to, but the crossover rules ensure there'll be few to no snarls if they do. For example, the Supernal Realms of ''MageTheAwakening'' and the Shadow World of ''WerewolfTheForsaken'' have little to do with each other, but equally don't step on each other's cosmological toes.
** The Shadow World is also explicitly part of the Mage cosmology. The only problem we currently have with the cosmology is the "Two Arcadias" hypothesis. In Mage, {{Arcadia}} is the [[AscendToAHigherPlaneOfExistence Supernal]] Realm of Time and Fate, and separated from the human world by the [[EldritchAbomination Abyss]], a massive rent in reality; while in ''ChangelingTheLost'', Arcadia is a realm where humans are kidnapped off to and transformed into Changelings. Some believe that these are two different realms, while others believe they are the same realm. The books state that the answer is to be determined by the GameMaster, but offers suggestions for both options. It's also possible that [[TakeAThirdOption both are true]]: there is a "Fallen" Arcadia and a "Supernal" Arcadia which were originally one realm and now separated by the Abyss, but the Watchtower of the Lunargent Thorn bridges the gap and allows them to intersect and interact.
* ''{{Exalted}}'' originally started as kind of a 'sword and sorcery' anime-styled game setting with players portraying different varieties of Exalted, all with their own powers, to appeal to ''D&D'' fans. Then someone went "Hey, wouldn't it be cool if we tweaked it so people could play ''Exalted'' versions of their [=WoD=] characters?" After that and until the old WorldOfDarkness ended, Exalted was treated as a forgotten pre-history of the setting. The Dragon Kings first described in the Mokole book are a part of the setting, as are the Neverborn that first appeared in WraithTheOblivion. The Scarlet Phoenix and Ebon Dragon of the ''KindredOfTheEast'' cosmology appear as major characters. Most of the WerewolfTheApocalypse cosmology's Celestines (as well as Gaia) appear in very similar forms, and it was intended that the Imbued of HunterTheReckoning were an attempt to bring back the Solar Exalted (which didn't work out as well, as modern people simply weren't able to handle that sort of power). Some of the Exalted types are pretty obvious as to connections (Sidereals = Mages, and Lunars = Shapeshifters), but the most tenuous link was the Abyssal Exalted and the vampires, with implications that one of the Deathlords was supposed to be Caine. But then the old [=WoD=] ended and a new edition of Exalted was released, and it just didn't matter that much any more (although the Sidereals' Great Prophecy is still implied to be intended to divert the world from becoming the [=WoD=]).
* ''Rifts''. Just Rifts.
** Want ''Robotech'' mecha to fight the Teenage Mutant Ninja Turtles alongside unicorn-riding cyborgs, only to have them all ambushed by eldritch abominations? Rifts. Palladium games specifically published conversion books for incorporating their other franchises into Rifts rules.
* The ''{{Warhammer}}'' and ''{{Warhammer 40000}}'' universes (universi? universeses? I dunno) used to be linked, although the linking statements were made by mad characters. The whole saga/background is told through an {{unreliable narrator}} anyway. [[WordOfGod Games Workshop]] has stated that the link is now done away with, since it was mostly silly anyway.
** To elaborate, Warhammer world used to be a planet in the 40k universe, surrounded by warp storms that made it inaccessible for the rest of the galaxy. Nowdays they exist in separate universes, but there appears to be a small link between them in the form of the Warp (the Chaos Gods are the same in each universe, and some people in Warhammer world have gotten visions of Chaos in 40 universe. Also the [[{{Precursors}} Old Ones]] in ''Warhammer'' appear to be the same as the ones in 40k, and a fan theory suggests they escaped from 40k universe to ''Warhammer'' one after the War in Heavens). There is no real interaction between the two universes, however, unless you count some daemon characters popping up in both universes and a few magic items that have a suspicious resemblance to 40k technology.
* ''MagicTheGathering'' has had two highly interesting incidences of this. The Kamigawa block ends with the protagonist exiled to a new world, sightless(so he has no real idea where he is) - and we discover in the Time Spiral books that Tetsuo Umezawa, defeater of the last Elder Dragon, Nicol Bolas(both from Legends), was a descendant of his. So Kamigawa took place at least a few millenia before "present-day" Dominaria. Then there's Ravnica, and the way it's been cut off from the rest of the Multiverse for a couple of millenia by the time we join the characters. The cause? Seems the Shard Urza formed after the Brothers' War had farther-reaching effects than was realized. Yet another story, seemingly set in the present but having a surprising connection to Dominaria's past.
* The ''{{GURPS}}'' Infinite Worlds setting ties together every alternate universe they ever came up with and every licensed work ever adapted to ''GURPS'' from ''{{Uplift}}'' to ''{{Diskworld}}'' to ''{{Hellboy}}''.
[[/folder]]

[[folder:Video Games]]
* ''StreetFighter Alpha'' effectively combined the ''Street Fighter'' and ''FinalFight'' franchises into one shared continuity, by featuring Guy and Sodom from the first ''Final Fight'' as playable characters, followed by Rolento in ''Alpha 2'' and Cody in ''Alpha 3''..
** On the other hand, ''Final Fight'' was apparently originally intended to be a sequel to the first ''Street Fighter'', although this doesn't necessarily mean that ''Final Fight'' was officially supposed to take place in the same continuity as the original ''Street Fighter''.
* ''MegaManLegends'' was originally in its own continuity (hence jokes and references to the original series being a ShowWithinAShow). However, the recent ''MegaManZero'' and ''MegaManZX'' games have more directly connected it as being the far distant future of the original ''MegaMan'' and ''MegaManX''.
* When SNK made ''Art of Fighting 2'', they decided to officially make the ''{{Art of Fighting}}'' series part of the same continuity as the ''FatalFury'' series. To explain why the ''Art of Fighting'' cast were not around during the events of the ''Fatal Fury'' games, they made the ''Art of Fighting'' series a prequel to the ''Fatal Fury'' series by setting it ten years before and putting a young Geese Howard as the TrueFinalBoss in ''Art of Fighting 2'' (back when he was still the police commissioner of South Town). When SNK later wanted to cross the ''Fatal Fury'' cast with the ''Art of Fighting'' cast in ''{{The King of Fighters}}'' games, they had to place the third series in a separate continuity.
* The ''FinalFantasy'' series has a few counts of direct crossover, such as Gilgamesh (seems to be the same person in every game he appears in) and Cloud (who features as a guest character in ''FinalFantasyTactics''), as well as the Ivalice Alliance series, which was retconned into the same world as ''VagrantStory'' and ''Final Fantasy Tactics''.
** Similarly, hints have been dropped [[FinalFantasyX2 here and there]] (and WordOfGod has outright stated) that ''FinalFantasyVII'' takes place in the far future of the ''FinalFantasyX'' world, on a different planet.
** The first connection was actually FinalFantasyIX, which was a millenia-later sequel to FinalFantasyI.
** And then ''[=~Dissidia: Final Fantasy~=]'' made it so they're all parallel worlds in a shared multiverse, although it's canonicity is uncertain. Would make sense, though. It is a series.
** ''FinalFantasyIVTheAfterYears'' reveals that every crystal-based Final Fantasy game is in the same universe. [[spoiler:The crystals are placed on a planet with promise, both to guide and record the evolution of the planets; hence why they all have humans, and not-entirely-different environments from the other Final Fantasies. To prove it, the party fights such recorded monsters as [[FinalFantasyI The Four Fiends]], [[FinalFantasyIII the Dark World Crystal Guardians]], [[FinalFantasyV Gilgamesh, and the superbosses Omega, Shinryu]], [[FinalFantasyVI Death Gaze and Ultima Weapon]].]]
* When Valve Software brought on board the creators of popular freeware game ''Narbacular Drop'' to create a Source-engine remake of their portal-based puzzle game, they decided during the writing process to subtly integrate the new game into their ''{{Half-Life}}'' universe. The resulting game, ''{{Portal}}'', starts off appearing to be totally separate, but as the game continues, increasing references are made to Black Mesa and something terrible happening in the outside world (presumably the Combine invasion prior to ''Half-Life 2''). During the conclusion to ''Half-Life 2: Episode Two'' references are also made to the organisation featured in ''Portal'', confirming the links between the two.
* In a strange example, the version of ''SuperMarioBros. 2'' that was released in the U.S.A. was, in fact, nothing more than a remake of another Japanese game called ''Yume Kōjō: Doki Doki Panic''. Since then enemies from ''Yume Kōjō: Doki Doki Panic'', such as Shy Guys, have made their way into Mario canon, despite being from a game that was never intended to be part of the Mario series.
* The [[MegaCorp Ultor Corporation]], from ''RedFaction'', a science-fiction series about Martian rebels, makes an appearance in ''SaintsRow'', a series about gang warfare in a contemporary American city. ''RedFaction: Guerilla'' references this with "Mount Vogel", named after the CEO of Ultor in ''SaintsRow 2''.
* The sheer amount of shout-outs to [[NightsIntoDreams NiGHTS]] in the SonicTheHedgehog series has led some people (including those of semi-official status) to claim they are in the same universe.
* ElementalWarOfMagic shares a ''lot'' of its terminology (especially in its backstory) with GalacticCivilizations, indicating that the game may be set on ancient Altaria and the channellers are SufficientlyAdvancedAliens.
[[/folder]]

[[folder:Webcomics]]
* The ''{{MS Paint Adventures}}'' series ''{{Problem Sleuth}}'' was tied into the earlier ''Jailbreak'' series when Zombie Ace Dick and his whale crashed into the jail where ''Jailbreak'' was set. Indeed, a dead whale was part of an early ''Jailbreak'' puzzle, and ZAD and the Completely Sane Man were revealed to be the skeletons in one of the cells.
** In another example, ''{{Homestuck}}'''s [[{{Show Within A Show}} Comic Within A Comic]] ''{{{Sweet Bro And Hella Jeff}}'' predates ''Homestuck''. It was originally written as a parody of another webcomic called ''[[http://forums.penny-arcade.com/showthread.php?t=85435&page=3 Higher Technology]]'', and was written into ''Homestuck'' as a webcomic run by Dave Strider.
* In ''StarslipCrisis'', the character of Vore is all but explicitly stated to be in fact Vaporware from the author's previous webcomic, ''Checkerboard Nightmare''. However, this can be considered only to be a partial example, since said strip's events are never mentioned in ''Starslip'' and Vore himself seems to have lost his memory up to that point, causing a bit of a personality change (yes, Vaporware also expressed desires to exterminate mankind, but Vore's a lot more proactive about it), so for all intents and purposes Vore can be considered a separate character.
** Recently he returned and he's calling himself Vaporware again.
* ''CrossoverWars'' and ''TheCrossoverlord'' established many webcomics as part of the same multiverse with rules more akin to Westphall's mind. The [[http://www.webcomicsnation.com/crossoverlord/REALITEASE.php Realitease]] [[AllThereInTheManual page]] done by ''Crossoverlord'' creators contains interesting informations about which webcomics happens in the same universe with lists of proofs and explanations:
** ''Fans!'' and ''CollegeRoomiesFromHell'' seems to be set not only in the same universe but also share it with ''eight'' other webcomics.
** ''SomethingPositive'' shares world with ''Queen Of Wands'', ''Scandal Sheet'', ''Girls With Slingshots'', ''QuestionableContent'' and ''Penny and Aggie''. Recently, for instance, the cats from S* P and GWS had a litter of hypoallergenic kittens.
** ''{{Megatokyo}}'', ''AppleGeeks'', ''[[CtrlAltDel Ctrl+ Alt+ Del]]'', ''QuestionableContent'', ''[[WalkyVerse Shortpacked]]'' and ''DieselSweeties'' are all set in one Universe.
** ''{{Mindmistress}}'' shares a universe with ''ClanOfTheCats'' and ''LCD'', as well as with ''ZebraGirl'' or her alternate counterpart.
** Not confirmed in the cases of ''{{Lightbringer}}'' and ''TheGreenAvenger'' as they can either share worlds with webcomics whose main characters made a {{Cameo}} during their adventures, or that's only their alternate counterparts.
* ''HeroesUnite'' did it with a horrifying amount of SuperHero webcomics, hosted on DrunkDuck. First it estabilished that ''{{Energize}}'', ''{{Bombshell}}'' and an alternate counterpart of {{Acrobat}} share an universe, and then a bunch of other superheroes joined in. Some writers even took an advantage of it to make their webcomics more popular. The creators of ''{{Energize}}'' and ''{{Dasien}}'' did a short (currently on hiauts) crossover between their characters, while the former used a new SharedUniverse to bring back his other webcomics - ''Fearless'', {{SHELL}} teamed up with TheBlondeMarvel and Bombshell and gets his ass kicked by one of HeroForce members before joining HU, and Vora, Princess Of The Skies, appeard few times in HU before getting her own adventures. And it's all one reality in the webcomis multiverse.
* ''SugarBits'' might have done it when one of the villains summoned Red [[spoiler: and Big Bad Wolf]] from ''EverAfter'' to fight protagonists. Hoever, given the nature of the ''SugarBits'' world and [[WordOfGod Bleedman's own words]], those two comics may or may not share an universe and this will remain unresolved until Endling, creator of ''Ever After'', will confirm it.
* T Campbell has done this with various webcomics he's written or co-authored, both played straight and using alternate versions of characters.
** ''PennyAndAggie'', ''Cool Cat Studio'' and ''Sketchies'' are set in the same universe. However, the SF and supernatural elements in ''Cool Cat Studio'' are absent from the other two comics. Campbell once [[WordOfGod explained]] this on the ''P&A'' forum by stating that such elements exist on the periphery of the comics' shared universe, so not all its inhabitants experience, nor are even aware of, such things. This is in contrast to the ''{{Fans}}'' universe (and its alternate versions of ''P&A'''s characters), where, particularly after the {{Revival}}, paranormal occurrences are so frequent and prominent that the entire world is aware of them.
** Alternate versions of characters from ''PennyAndAggie'' and ''{{Fans}}'' appear in each other's universes.
* Barry T. Smith's ''{{InkTank}}'' appeared to be in an entirely new universe from the previous strips... until a story arc which ended with the AuthorAvatar having a nervous breakdown was resolved by Dante from ''Angst Technology'' turning up and treating him to a coffee.
* Artist Ursula Vernon's ''{{Digger}}'' webcomic, an anthro adventure about a mildly cynical wombat and a statue of the god Ganesh, has this if you start reading her other work. An awful lot of everything she's done seems to have characters in common with the Gearworld, her vaguely-steampunk clockwork-labyrinth art-and-fiction setting. It's only vaguely hinted at in ''Digger'' itself.
[[/folder]]

[[folder:Web Original]]
* The (In)Famous DavidGonterman, EdWood of the World Wide Web and the Internet's Most Dangerous Cartoonist; reuses characters, concepts and names so often; that it more or less seems that every single thing he's ever written or drawn are all set in the same vague universe/multiverse. This may be partially intentional... but... well...
* ThatGuyWithTheGlasses likes this trope, finally creating an official merging of every TGWTG-involved character during the huge anniversary brawls, and doing so in-character during {{Kickassia}}.
[[/folder]]

[[folder:Western Animation]]
* {{Disney}}, if you can believe it, did this. ''LiloAndStitch'' had crossovers with ''KimPossible'', ''TheProudFamily'', ''{{Recess}}'', and ''AmericanDragonJakeLong''.
** There was also an episode of ''{{Hercules}}'' in which Jafar and Hades cut a deal to eliminate each other's enemies, resulting in an ''Disney/{{Aladdin}}'' crossover.
* In the ''SouthPark'' episode "Super Best Friends", there is a brief scene of the cast of ''ThatsMyBush'' in the White House, indicating that the two series (both created by Matt Stone and Trey Parker) take place in the same universe (which is particularly silly, since ''ThatsMyBush'' is a live-action show).
** And another Comedy Central show, ''DrKatzProfessionalTherapist.''
* ''TheSimpsons'' and ''{{Futurama}}'' are MutuallyFictional - Matt Groening appeared in The Simpsons as "the creator of Futurama", and Bart Simpson dolls were found on a Lunar waste dump by Bender in Futurama.
** The first ''Futurama/Simpsons'' Bongo Comics crossover comes about as the Brainspawn zapped the Planet Express crew into an old ''Simpsons'' comic. The second has the ''Simpsons'' characters [[spoiler:and later, many other fictional characters]] materialising into the reality of ''Futurama'' from a comic by one of Farnsworth's inventions.
** Bender also makes a cameo in a ''Simpsons'' episode showing the eponymous family in their future (in-universe chronology)
** Even ''FamilyGuy'' had Peter talking to Bender from Futurama "for some reason" (and outside of a ManateeGag even!)
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