There is a vast universe with multiple series taking place in different places/time periods/whatever, and a Cross Through is a StoryArc that starts in one of these series and cycles through several self-contained series (alternating between them), affecting each one, usually with one recurring element or character appearing in all parts. Compare with SharedUniverse and {{Crossover}}.

The trope's name was coined by comic writer [[http://farawaypress.com/Home/tabid/58/Entry%20ID/132/Default.aspx John Jackson Miller]] for ''Franchise/StarWars: Vector'', which is an example.

Compare the CrisisCrossover (a step up in terms of interconnectedness) and the RedSkiesCrossover (a nice big step down.)
----
!!Examples:

* ''Franchise/StarWars: Vector'' is a CrossThrough of four ''Star Wars'' comic book series that take place during different time periods, featuring an ArtifactOfDoom of an ancient Sith Lord that carries a plague of [[TheVirus Rakghouls]]. The plot starts in ''KnightsOfTheOldRepublic'' (the year 3,963 [[YearZero Before the Battle of Yavin]] [[ANewHope [the original film]]]), then cycles through ''Dark Times'' (19-18 BBY), ''Rebellion'' (1-2 ABY), and ends in ''StarWarsLegacy'' (137 ABY).
** The ''Franchise/StarWars'' books ''Legacy of the Jedi'' and ''Secrets of the Jedi'' are also apparently this according to their descriptions.
** The book ''Rogue Planet'' takes place in the prequel era prior to the Clone Wars, but it directly ties into the ''NewJediOrder'' series, concurrently-published but set generations later.
** ''Millennium Falcon'' is one of these, following the ''Falcon'''s history through the Clone Wars up to Han's ownership of it. And it works well.
* SHIELD Agent PhilCoulson seems to be working his way through the MarvelCinematicUniverse one film at a time as the HeroOfAnotherStory.
** This culminated for him in ''Avengers'', [[spoiler:which saw him die at Loki's hands]]. He's still proven to be a pretty popular character, given that he seems to have been invented solely for the films and has since become a CanonImmigrant to the rest of the Marvel Universe, as well as the main character in ''Series/AgentsOfSHIELD''
** The events of ''Film/CaptainAmericaTheWinterSoldier'' cross through very prominently into ''Series/AgentsOfSHIELD.''
* One of the latest ''Franchise/StarTrek'' games, ''VideoGame/StarTrekLegacy'', does this.
** There were several series of ''Franchise/StarTrek'' books that did the same thing, with the crews of the [[Series/StarTrekTheOriginalSeries original series]], [[Series/StarTrekTheNextGeneration TNG]], [[Series/StarTrekDeepSpaceNine Deep Space Nine]] and [[Series/StarTrekVoyager Voyager]] all facing the same villains.
*** ''Invasion'' was the first, with the Furies making their first strike in 2267 (TOS), returning in 2369 (TNG), the enemy that originally drove them out of the Alpha Quadrant returning in 2371 (Deep Space Nine), and their final defeat occurring in the Delta Quadrant the same year (Voyager).
*** ''Day Of Honor'', which culminated in the ''Series/StarTrekVoyager'' episode of the same name.
*** ''The Captain's Table'', a bar from another dimension that [[GoodGuyBar only admits captains]]. Originally six novels, featuring Kirk and Sulu, Picard, Sisko, Janeway, [[StarTrekNewFrontier Calhoun]], and Pike; a later book, ''Tales from the Captain's Table'', turned this into short story format with more captains (including Riker of the ''[[Literature/StarTrekTitan Titan]]'', Picard in his ''[[Literature/StarTrekStargazer Stargazer]]'', Chakotay of the ''[[Literature/StarTrekVoyagerRelaunch Voyager]]'' post-ending, Klag of the ''[[Literature/StarTrekKlingonEmpire Gorkon]]'' (a decade after the exchange program with Riker), Colonel Kira of ''Deep Space Nine'' (whose Bajoran military rank is a captain equivalent), Captain Archer, Demora Sulu 40 years after ''[[Film/StarTrekGenerations Generations]]'', Captain David Gold of the ''Literature/StarfleetCorpsOfEngineers'' e-Book series, and Shelby a decade after "Best of Both Worlds" (and from the ''New Frontier'' timeline)).
*** ''Double Helix'', in which the "villain" was a virulent disease, featured a mix 'n' match approach, with characters not necessarily appearing in the time period most associated with them: 2364 (''Next Gen'' Season 1); 2366 (''Next Gen'' Season 3/''Deep Space Nine'' during the Occupation); 2369 (very old Spock and [=McCoy=]); 2371 (the Maquis: Tom Riker prior to ''Deep Space Nine'' Season 3/future ''Voyager'' characters); 2375 (Movie-era ''Next Gen''/''[[StarTrekNewFrontier New Frontier]]''); and 2350 ({{Prequel}}: ''[[Literature/StarTrekStargazer Stargazer]]''/Ensign Tuvok).
*** ''Gateways'', wherein the Iconian gateways spring to life again, with disastrous results. Gives the interesting hook of an opening real-time holoconference between many of the principles.
*** This is basically the plot of ''Film/StarTrekGenerations'', where Kirk falls into the Nexus and Picard meets him there, with a 78-year long mystery about Kirk's fate in between.
*** ''Literature/StarTrekTheBraveAndTheBold'' was a series of novels in which all four crews had to deal with one of four legendary artifacts - with a framing story in which [[Series/StarTrekEnterprise Jonathan Archer]] (whose first season was still in production) was the first human to hear the legend! Also, much like the [[Creator/DCComics DC Comic]] of the same name (which also gave rise to ''WesternAnimation/BatmanTheBraveAndTheBold''), each crew was paired with a lesser-known crew from their timeline (Kirk with Commodore Decker and the ''Constellation'' from "The Doomsday Machine", [=DS9=] with the ''Odyssey'' crew from "The Jem'Hadar"; Voyager with Captain [=DeSoto=] and the ''Hood'', Riker's post prior to the ''Enterprise'' (and Chakotay's Maquis cell teaming up with Cal Hudson's Maquis cell), and the Next Gen crew teaming with Captain Klag from the ''Gorkon'', a decade after the exchange program with Riker).
* A two-part episode of ''WesternAnimation/JusticeLeague'' had Batman, Wonder Woman, and Green Lantern chasing a MadScientist through time and joining forces first with the Heroes of the Old West, and later with [[WesternAnimation/BatmanBeyond Future Batman]], [[StaticShock Old Static]], and Warhawk (the son of Green Lantern and Hawkgirl).
* The concept is also used in the Franchise/DoctorWhoExpandedUniverse.
** ''Blood Harvest'', a Literature/DoctorWhoNewAdventures novel where the Seventh Doctor fights vampires in 1930s Chicago and on Gallifrey, led into the very first of the Literature/DoctorWhoMissingAdventures, ''Goth Opera'' by Creator/PaulCornell, which had the Fifth Doctor fighting vampires in 1990s Manchester, as a fairly obvious ploy to get new readers interested in the Missing Adventures books. (A short comic in a ''Doctor Who Annual'' by Creator/PaulCornell also led into ''Goth Opera''.)
** The later Missing Adventure ''Cold Fusion'' by Lance Parkin is a Fifth Doctor novel that also features the Seventh Doctor, and fit into an ongoing New Adventures StoryArc which had, in real world terms, actually concluded some time ago. However in terms of the Seventh Doctor's timeline it fit into between two of the books in that StoryArc.
** BBC Books Literature/PastDoctorAdventures had a StoryArc in which the companions of various Doctors were seemingly killed in TimeyWimeyBall situations. This tied into the "Sabbath" arc in the Literature/EighthDoctorAdventures. One of these [=PDAs=], ''Wolfsbane'', also featured the Eighth Doctor during the [=EDAs=]' "amnesia" arc.
** The AudioPlay/BigFinishDoctorWho ''Destiny of the Doctor'' 50th anniversary year audio drama series turns the traditional multi-Doctor story into a crossthrough. Each Doctor has an adventure that involves a different [[PlotCoupon powerful technobabble gizmo]]. During the story, a mysterious message from [[Creator/MattSmith a future Doctor with a bow-tie and no attention span]] tells the Doctor he needs to save the gizmo, because that future Doctor needs them for his own plans to fight back an alien invasion.
** The Dalek Time Controller originated in the Big Finish monthly range where it met the 6th Doctor. Then it gets hurled back in time to become the BigBad for the GrandFinale of the New Eighth Doctor Adventures and then Dark Eyes. To make things more complicated, it turns out from the Dalek Time Controller's perspective its earliest encounter with the Doctor was in the New Series Adventures novels, where it met [[HaveWeMetYet the 11th Doctor]].
** The Excelis saga from Big Finish, in which three Doctors visit the planet Artaris at different points in its history: the Fifth (and Franchise/IrisWildthyme) in its DungAges (''Excelis Rises''); the Sixth in a {{Steampunk}} and spiritualism period (''Excelis Rises'') and the Seventh when it's become a futuristic {{Dystopia}} (''Excelis Decays''). And then Franchise/BerniceSummerfield and Iris visit AfterTheEnd (''Professor Bernice Summerfield and the Plague Herds of Excelis'').
** In Big Finish [[FogOfDoom The Eminence]] were originally created for the third series of "The Fourth Doctor Adventures". However they ended up appearing first in "The Seeds of War", a story in the monthly range featuring the Sixth Doctor. They next appeared in Dark Eyes 2 as major villains and look set to continue in Dark Eyes 3. After Dark Eyes 2 they make their appearance in the Fourth Doctor Adventures.
** The ''Worlds of Doctor Who'' storyline in from Big Finish is a crossthrough between the spin-offs. starting in VictorianLondon with ''Jago & Lightfoot'', then continuing into TheSixties with ''Intrusion Countermeasures'', arriving in the PresentDay with the ''Companion Chronicles'' subseries ''Tales from the Vault'' (UNIT) and finishing with a crossover between the Sixth Doctor and the ''Gallifrey'' audios.
** Followed up by ''Worlds of Creator/BigFinish'', which does the same thing for series with less direct ''Doctor Who'' connections[[note]]''Tales from the Vault'' is the only series in ''WODW'' that doesn't star a character from the TV series, and its ''WODW'' chapter includes the Doctor himself; by contrast ''none'' of the characters in ''WOBF'' actually appeared in the series.[[/note]]: ''Franchise/BerniceSummerfield'', ''Franchise/IrisWildthyme'', ''Graceless'', ''Vienna'', ''Series/TheConfessionsOfDorianGray'' and ''Franchise/SherlockHolmes''. (The latter two are loosely tied to ''Doctor Who'' via the Professor Summerfield audio ''Shades of Gray'' and WordOfGod saying it's the same Sherlock Holmes from the ''Literature/DoctorWhoNewAdventures''.)
* ''DisneyAdventures'' once serialized a five-issue story called "TheLegendOfTheChaosGod" (no relation to ''TabletopGame/{{Warhammer 40000}}''), involving an ArtifactOfDoom containing a SealedEvilInACan; the comics cycled through more or less the entire DisneyAfternoon lineup, starting in ''WesternAnimation/TaleSpin'' and continuing decades down the timeline in ''WesternAnimation/ChipNDaleRescueRangers'', ''WesternAnimation/GoofTroop'', ''WesternAnimation/DuckTales'', and finally ''WesternAnimation/DarkwingDuck'' (which, despite all being in the modern day, never directly crossed each other aside from Scrooge phoning Darkwing to warn him of the threat, and the already shared characters of Launchpad and Gizmoduck), [[spoiler: where the unsealed evil [[HoistByHisOwnPetard is blasted by his own magic bolts reflected off a satellite dish]] and is safely re-sealed; as it turns out, the legendary hero who sealed the self-proclaimed "Chaos God" away in the first place fought him with a mirrored shield]].
* Creator/GrantMorrison's ''SevenSoldiers'' was this; with seven heroes all individually fighting the same threat. This was in fact enforced by the bad guys, who targetted seven-member enemy teams; if the heroes were to succeed they ''couldn't'' meet each other.
* When the USANetwork was carrying Saturday morning cartoons, they had one day devoted to a storyline centered around the [[OriginalGeneration original character]] the Warrior King (voiced by Creator/MichaelDorn), wandering around each show's universe in search of a powerful MacGuffin. The specific episodes he appears in are, in chronological order, "The Warrior King" (''WesternAnimation/StreetFighter''), "Endgame" (''ComicBook/TheSavageDragon'', the only series out of the four to be based on a comic book series rather than a video game), "Resurrection" (''WesternAnimation/MortalKombatDefendersOfTheRealm'', focusing solely on the [=MacGuffin=]; the Warrior King makes only a cameo as a shadow at the end, leaving many ''Franchise/MortalKombat'' fans unaware of the crossthrough confused) and "Recreation" (''WesternAnimation/WingCommanderAcademy'').
* ''The Fall Of The Mutants'' storyline in the ''ComicBook/XMen'' comics in the mid-80s. The three titles involved don't directly cross into each other (The NewMutants were the only ones who even knew what the other two teams were up to). Instead, the books are a crossover in the thematic sense of loss and rebuilding: the X-Men's deaths and resurrection, Angel from Comicbook/{{X-Factor}} becoming Archangel, the New Mutants losing one of their own and becoming full superheroes, and the subsequent formation of Comicbook/{{Excalibur}}.
* After ''Fall'', there was ''ComicBook/{{Inferno}}'', where the demons Sym and N'astirh bring HellOnEarth. While this was a ''Franchise/XMen'' crossover, numerous other titles were involved in the "fighting the evil forces of Hell" bit.
* Creator/IDWPublishing loves [[MassiveMultiplayerCrossover Massive Multiplayer]] Cross Throughs since 2011. The only thing they have in common is that they always involve a ''Franchise/{{Transformers}}'' universe (and even then, it's always a different ''Transformers'' universe each time):
** 2011: ''Infestation'', in which an attempt by IDW's own ''Covert Vampiric Operations'' to contain an interdimensional breach of {{hive mind}}ed zombies from the ''Zombies vs. Robots'' universe goes awry, allowing the zombies to infest ''ComicBook/TheTransformersIDW'', the StarTrekExpandedUniverse (circa the [[Series/StarTrekTheOriginalSeries original series]]), ''ComicBook/GIJoeIDW'', ''Franchise/{{Ghostbusters}}'' and ''[[ComicBook/PocketGod Pocket God Comics]]'', attempting to bolster their strength by assimilating each world's powers. Also qualifies as a CrisisCrossover for ''some'' of the series involved, with the ''Transformers'' segment heralding the return of Galvatron to the IDW continuity following his rebirth in the ''TransformersAllHailMegatron'' codas (which is later explored OnceMoreWithClarity in the ''Heart of Darkness'' miniseries) and having a Transformer be PutOnABus ([[TheBusCameBack which would come back]] in later Crisis Crossover ''ComicBook/TransformersDarkCybertron''), the ''Ghostbusters'' segment serving as the launching point for [[ComicBook/{{Ghostbusters}} the ongoing comic]] and ''CVO'' seeing a major status quo change at the end. On the other hand, ''G.I. Joe'' is a BottleEpisode in a top-secret isolated setting known only by very few Cobra operatives, ''Star Trek'' is never referenced again in ''Star Trek'' comic continuity and ''Pocket God Comics'' is, being a post-event gag comic and as per the closing issue of the event, non-canon to ''the Cross Though itself''
** 2012: ''Infestation 2'', this one starring [[Creator/HPLovecraft the Elder Gods]] in place of Zombies, and ''Transformers: Hearts of Steel'' (A Victorian era SteamPunk {{Elseworld}}), ''[[ComicBook/TeenageMutantNinjaTurtlesIDW Teenage Mutant Ninja Turtles]]'' and the ''TabletopGame/DungeonsAndDragons'' {{Eberron}} campaign in place of the main IDW ''Transformers'' continuity, ''Star Trek'' and ''Ghostbusters'' (''CVO'' and ''G.I. Joe'' return for a second round).
** 2013: The ''Film/MarsAttacks'' comics had a month-long non-canon-for-everyone series of five seperate IntercontinuityCrossover one-shots where Mars Attacks ComicStrip/{{Popeye}}, Music/{{Kiss}} (really), WesternAnimation/TheRealGhostbusters[[note]]They do specifically mean the universe of ''The Real Ghostbusters'' animated series, not any other incarnation of the ''Franchise/{{Ghostbusters}}'' franchise[[/note]], The Transformers[[note]]Specifically, a one-off universe that is more or less an AffectionateParody of [[WesternAnimation/TheTransformers the G1 cartoon]][[/note]] and ''Zombies vs. Robots''. Given the more (blackly) humorous nature of the ''Mars Attack!'' IP compared to zombies or {{Eldritch Abomination}}s, there's no multiversal story involving ''CVO'' that justifies the crossthrough this time, only Martians invading without any explanation as to how they travel across the multiverse.
** 2014: ''Series/TheXFiles: Conspiracy'', where, after receiving a cryptic file from the future, Series/TheLoneGunmen must seek out (''X-Files'' universe incarnations of) the Ghostbusters, the Teenage Mutant Ninja Turtles, the Transformers [[note]]a present day continuation of the ''Hearts of Steel'' universe [[/note]] and Franchise/TheCrow for clues that could help Mulder and Scully stop a virus that threatens to wipe out a large chunk of mankind.
* Salem of ''Series/SabrinaTheTeenageWitch'' had eaten a [[TimeyWimeyBall time ball]] and traveled through the other three shows airing on TGIF at the time: ''BoyMeetsWorld'', ''TeenAngel'', and ''You Wish''.
* Creator/CartoonNetwork ran an event called "Cartoon Network Invaded", which involved cheese-craving aliens from the moon that turn into werewolves. The shows involved were ''WesternAnimation/FostersHomeForImaginaryFriends'', ''WesternAnimation/EdEddNEddy'', ''WesternAnimation/MyGymPartnersAMonkey'', ''WesternAnimation/CampLazlo'' and ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'', with a few cameos from uninvolved Cartoon Network shows thrown in for good measure. The crossover ended with the aliens concluding that the Earthlings were smarter than they thought and proceed to suck out the intelligence of their five abducted characters. Unfortunately for them, they turn out to be [[TheDitz five of the dumbest characters from each of the shows]] (Cheese, Ed, Slips Python, Skip the dung beetle, and Fred Fredburger). All five of these shows have alternate endings that sever their connections to the event; for example, instead of the brain-sucking scene described above, the ''Billy and Mandy'' episode ended with a CrossoverPunchline with ''WesternAnimation/CodenameKidsNextDoor''.
* ''BrightestDay'' wound up being this; all the storylines came out of ''BlackestNight'' and many were unified under "people resurrected by the White Entity for a specific task", but each series involved was pretty much self-contained with little overlap.
* DisneyChannel did one of this in regards to their {{SitCom}}s: the main characters of ''CoryInTheHouse'', ''TheSuiteLifeOfZackAndCody'', and ''HannahMontana'' saw a wishing star on the sky and made a wish (which came true and the episodes are BeCarefulWhatYouWishFor plots).
* Creator/DCComics 90s crossovers like ''ComicBook/UnderworldUnleashed'' and ''Day of Judgement'' were {{Crisis Crossover}}s, but some of the secondary books were more Cross Throughs, with characters fighting over-powered villains/ghosts and demons without ever getting involved in the main story, or even learning what was actually going on.
* MarvelComics had ''Acts of Vengeance'' in the late 80s, where SelfDemonstrating/{{Loki}}, who after all these years is still bitter for being responsible for Franchise/TheAvengers, has the world's top bad guys band together to pit heroes against villains they haven't faced before. Throughout the titles the heroes face their respective unfamiliar opponents off without any thoughts that a cabal had set up their confrontations, and there are no plot developments for the Cross Through except for a few incidents where certain members of the cabal gets dispatched or caught or just plain leave, just to explain why they're missing or where they are in the finale. As for said finale, it happened in just one regular-sized issue of ''Avengers West Coast'' where the title's heroes just declare out of the blue that Loki is the mastermind, let a captured collaborator make his escape so that they can follow him to Lokis' hideout, attack said hideout (making the remaining collaborators flee and go back to their own regular businesses), and [[CurbStompBattle quickly dispatch]] Loki, all of these happenings serving just as an interlude between the set up and the cliffhanger for the title's next story-arch! Cross Through to the end!
* ''ComicBook/{{Night of the Owls}}'', a [[Franchise/{{Batman}} Bat-family]] storyline launching just after the ComicBook/{{New 52}}. The idea is that a cadre of rich, influential people have been ruling Gotham ever since its creation. Batman draws their attention by stopping an assassination, finding them, beating their assassin, and escaping from their clutches. In response, they raise an army of quasi-immortal, near super-powered assassins to strike at Batman and ''everyone'' associated with him. Every single Bat-family book faces off against a different assassin during the event.
* In 2011, a hurricane storyline ran across SethMacfarlane's three shows: ''TheClevelandShow'', ''WesternAnimation/FamilyGuy'' and ''WesternAnimation/AmericanDad''. Each episode of the night featured its main cast trapped in their homes due to a violent hurricane. And the end of ''American Dad'' (the last show to air on the block) ended with the homes of all three casts having been ripped free by the hurricane and resulting flooding and dumped in the same place.
* Both the book and movie versions of CloudAtlas use this as a primary narrative mechanic, slipping between six stories spanning at least four centuries (if not more!). It's especially interesting because each story is a different genre and, while all the protagonists ''might'' be connected, it's never made completely clear.
* A subtle version of this trope is employed by the ''WoodyWoodpecker'' comics and "Gnuff" comics by Freddy Milton. Since the Gnuff stories (in America known primarily from the ''Critters'' anthology mag) were originally printed as backup comics for the Scandinavian ''Woody Woodpecker'' magazine, Milton would occasionally slip in hints that Woody and the Gnuffs [[SharedUniverse lived in the same city]], and though the main characters never met, plot threads would occasionally carry over from one comic to the other, hinting that the separate adventures took place at roughly the same time. The most obvious example, though, is the character J. P. Phrogg, an AffablyEvil opportunist who debuted in Milton's ''Woody'' stories and would go on to appear in the ''Gnuff'' stories.
* On one Friday, The View, The Chew, and The Revolution had episodes focusing on dogs.
* On November 2, 2012, Disney responded to Hurricane Sandy by coordinating what may be the biggest CrossThrough in TV history. They called November 5 a "Day of Giving". From the event's web page:
** ''Good Morning America'' will start the "Day of Giving" by dedicating the entire 8:00 a.m. hour to raising money for Sandy Relief efforts. ABC News anchors, reporters and employees will band together to encourage people to donate to [[UsefulNotes/TheRedCross the American Red Cross]].
** The torch will pass to "LIVE with Kelly and Michael," where the show will integrate "Day of Giving" messaging into their highly anticipated Halloween episode (which was moved due to the impact of the storm).
** The ladies of "The View" will discuss the "Day of Giving" and encourage their audience to donate to [[UsefulNotes/TheRedCross the American Red Cross]] relief efforts, and "The Chew" will do the same.
** "Katie," which dedicated the entire hour on Wednesday, October 31 to Hurricane Sandy, will take up the mantle of the "Day of Giving" and engage viewers in these relief efforts as well.
** The ABC Owned Stations and local ABC affiliates will integrate "Day of Giving" messaging into their local news throughout the day, calling on their local communities to help those impacted by the storm.
** "World News with Diane Sawyer" will participate with messaging around "Day of Giving" and the continuing impact of the storm.
** "Dancing with the Stars" is planning to personalize sections of the live show Monday night with "Day of Giving" messaging, integrating stories of how Hurricane Sandy has impacted several of the dancers on the show.
** "Nightline" will devote time to the "Day of Giving" and the impact of Hurricane Sandy, and "Jimmy Kimmel Live," which has been airing from Brooklyn all this week and encouraging viewers to give to UsefulNotes/TheRedCross to help rebuild that impacted areas, will end the "Day of Giving" on Monday with special messaging and calls to action for Kimmel's viewers.
** ESPN will be running public service announcements to engage viewers in Hurricane Sandy relief efforts throughout its programming, including coverage of The New York City Marathon [[note]] The marathon would later be cancelled. [[/note]] and Monday Night Football.
** DisneyChannel aired what were called "age-appropriate" messages.
* Beginning in prog 1803, ''Comicbook/TwoThousandAD'' had a file containing the identities of all Wally Squad Judges at the centre of the ''Comicbook/JudgeDredd'', ''ComicBook/TheSimpingDetective'', and ''ComicBook/LowLife'' storylines. This culminated in prog 1812, which consisted of a single story featuring [[{{Crossover}} all three Judges]].
* In 2012, MarvelComics ran a ''ClanDestine'' story by Alan Davis through the ''ComicBook/FantasticFour'', ''ComicBook/{{Daredevil}}'' and ''Comicbook/{{Wolverine}}'' annuals.
* The Comicbook/{{New 52}} storyline ''The Black Diamond Probability'' follows the Heart of Darkness (Eclipso's black PowerCrystal) through ''Comicbook/DemonKnights'', ''[[ComicBook/JonahHex All-Star Western]]'', ''Team 7'' and ''Comicbook/{{Catwoman}}'' before concluding in ''[[Comicbook/AmethystPrincessOfGemworld Sword of Sorcery]]''.
* ''ComicBook/ArchieComicsSonicTheHedgehog'' had one interesting moment that closed out one book and started another. Near the end of the Scourge arc, Shadow the Hedgehog and Metal Sonic are part of the MeleeATrois for different reasons and, in the scuffle, disappear from the fight. The two show up in the ''ComicBook/SonicX'' universe during its final issue, leaving everyone there shocked as Shadow had been thought dead in that universe. At the end of that issue, the two blink out again and reappear in the Sol Dimension in the first issue of ''Sonic Universe'', which replaced ''Sonic X''.
* One of the earliest examples is the DCUniverse storyline collected in the "{{Zatanna}}'s Search" trade paperback.
* River City Wrestling and The American Pro Wrestling Alliance technically housed members of Wrestling/{{TNA}} {{power stable}} Wrestling/AcesAndEights but as the group's primary goal was "[[AllYourBaseAreBelongToUs takeover TNA]]", this was mostly incidental rather than some important development. There were some murmurings of visiting other chapters for recruitment on Impact but this had noticeable effect on anyone else. Ring Warriors actually did mention Wes Brisco's Aces & Eights involvement, [[SomebodyElsesProblem but didn't actually care beyond "hey look, he's on another TV show!".]]
* Outside of the occasional columns on its website, Wrestling/{{WWE}} prefers not to acknowledge the existence of any promotion they don't own the rights to, so when they used the facilities of say, 5th Avenue Entertainment and American Combat Wrestling in Florida for the purpose of their FCW developmental program, it's essentially this trope in play. ACW also has friendly(friendlier in fact) relations with Florida Underground Wrestling, Ring Warriors, the Wrestling/{{N|ationalWrestlingAlliance}}WA and the WWN Live four(FIP, [[Wrestling/DragonGate DG USA]], EVOLVE, SHINE)
* The threat of the Gentry is felt throughout ''ComicBook/TheMultiversity'' books, which can still be enjoyed individually.
* The "Dawn of X" storyline in ''ComicBook/MegaMan'', which involves the ''Videogame/MegaManClassic'' and ''Videogame/MegaManX'' characters dealing with the same threat in two different time periods (for the unaware, X is the future of Classic). Interaction between the two casts only happen in the Short Circuits segments.
----