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** The 2019-2020 event is ''Series/{{Crisis on Infinite Earths|2019}}'', having been foreshadowed steadily since ''The Flash'' Season 1 and sporadically throughout the other shows, it featured five episodes that span all recurrent Arrowverse series, including ''Supergirl'', ''Batwoman'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' (the last of these actually began its forthcoming season after the Crisis). This was the last time ''Arrow'' got to participate, as the show ended in 2020 and its final season focuses on {{Tonight|SomeoneDies}} TheHeroDies in the lead-up to and the aftermath of the Crisis. It is an adaptation of the classic [[ComicBook/CrisisOnInfiniteEarths comic of the same name]] AKA the TropeNamer. In addition to the return of 1990 Flash, it also features a cavalcade of guest and cameo appearances from other DC live-action adaptations from outside of the Arrowverse continuity, including Tim Burton's ''[[Film/Batman1989 Batman]]'', ''Series/{{Titans|2018}}'', the 1960s ''[[Film/Batman1966 Batman]]'' series, ''Series/{{Smallville}}'', [[CanonWelding a merger]] of ''Film/SupermanTheMovie'' and ''Film/SupermanReturns''[[note]]The Superman as portrayed by Creator/ChristopherReeve and Creator/BrandonRouth[[/note]], ''Series/{{Birds of Prey|2002}}'', ''Series/{{Lucifer|2016}}'', ''Series/{{Black Lightning|2018}}'', ''Series/{{Swamp Thing|2019}}'', ''Series/{{Doom Patrol|2019}}'' and the Franchise/DCExtendedUniverse. It also marks the debut of the titular character of ''Series/{{Stargirl|2020}}'', [[EarlyBirdCameo ahead of the series' premiere]] on the Creator/DCUniverse streaming service (which includes the aforementioned ''Titans'', ''Doom Patrol'' and ''Swamp Thing'')[[note]]A different version of ComicBook/{{Stargirl|DCComics}} previously appeared in Season 2 of ''Legends of Tomorrow'', played by Creator/SarahGrey[[/note]]. As with the comic book, this crossover has a ''huge'' impact on the franchise, as it ends up merging the ''Black Lightning'' Earth with Earth-38 (the universe where ''Supergirl'' is set) and Earth-1 (where the other four shows are set) into a single new reality.
to:
** The 2019-2020 event is ''Series/{{Crisis on Infinite Earths|2019}}'', having been foreshadowed steadily since ''The Flash'' Season 1 and sporadically throughout the other shows, it featured five episodes that span all recurrent Arrowverse series, including ''Supergirl'', ''Batwoman'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' (the last of these actually began its forthcoming season after the Crisis). This was the last time ''Arrow'' got to participate, as the show ended in 2020 and its final season focuses on {{Tonight|SomeoneDies}} TheHeroDies in the lead-up to and the aftermath of the Crisis. It is an adaptation of the classic [[ComicBook/CrisisOnInfiniteEarths comic of the same name]] AKA the TropeNamer. In addition to the return of 1990 Flash, it also features a cavalcade of guest and cameo appearances from other DC live-action adaptations from outside of the Arrowverse continuity, including Tim Burton's ''[[Film/Batman1989 Batman]]'', ''Series/{{Titans|2018}}'', the 1960s ''[[Film/Batman1966 ''[[Series/Batman1966 Batman]]'' series, ''Series/{{Smallville}}'', [[CanonWelding a merger]] of ''Film/SupermanTheMovie'' and ''Film/SupermanReturns''[[note]]The Superman as portrayed by Creator/ChristopherReeve and Creator/BrandonRouth[[/note]], ''Series/{{Birds of Prey|2002}}'', ''Series/{{Lucifer|2016}}'', ''Series/{{Black Lightning|2018}}'', ''Series/{{Swamp Thing|2019}}'', ''Series/{{Doom Patrol|2019}}'' and the Franchise/DCExtendedUniverse. It also marks the debut of the titular character of ''Series/{{Stargirl|2020}}'', [[EarlyBirdCameo ahead of the series' premiere]] on the Creator/DCUniverse streaming service (which includes the aforementioned ''Titans'', ''Doom Patrol'' and ''Swamp Thing'')[[note]]A different version of ComicBook/{{Stargirl|DCComics}} previously appeared in Season 2 of ''Legends of Tomorrow'', played by Creator/SarahGrey[[/note]]. As with the comic book, this crossover has a ''huge'' impact on the franchise, as it ends up merging the ''Black Lightning'' Earth with Earth-38 (the universe where ''Supergirl'' is set) and Earth-1 (where the other four shows are set) into a single new reality.
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* ''Series/TheDefenders2017'' is the self-contained type. It is an eight episode miniseries that sees [[Series/Daredevil2015 Matt Murdock]], Series/{{Jessica Jones|2015}}, Series/{{Luke Cage|2016}}, and [[Series/IronFist2017 Danny Rand]] team up to fight the Hand, a villainous organization built up in ''Daredevil'' season 2 and ''Iron Fist'' season 1. The crossover has lasting repercussions for the next phase of the Netflix shows, as [[spoiler:Matt's "death" in the climax, and subsequent turning up at a convent, sets up the third season of ''Daredevil'' to do a loose adaptation of the renowned ''ComicBook/DaredevilBornAgain'' storyline]].
to:
* ''Series/TheDefenders2017'' is the self-contained type. It is an eight episode miniseries that sees [[Series/Daredevil2015 Matt Murdock]], Series/{{Jessica Jones|2015}}, Series/{{Luke Cage|2016}}, and [[Series/IronFist2017 Danny Rand]] team up to fight the Hand, a villainous organization built up in ''Daredevil'' season 2 and ''Iron Fist'' season 1. The crossover has lasting repercussions for the next phase of the Netflix shows, as [[spoiler:Matt's "death" in the climax, and subsequent turning up at a convent, sets up the third season of ''Daredevil'' to do a loose adaptation of the renowned ''ComicBook/DaredevilBornAgain'' ''ComicBook/BornAgain'' storyline]].
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** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions (a majority of the companions of the [[Russell T. Davies]] era as a whole) to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
to:
** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions (a majority of the companions of the [[Russell T. Davies]] Creator/RussellTDavies era as a whole) to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
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** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
to:
** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions (a majority of the companions of the [[Russell T. Davies]] era as a whole) to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
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Up To Eleven is a defunct trope
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** The [[Series/PowerRangersMegaforce twenty-first season]] took the previous ''Rangers'' examples UpToEleven with its GrandFinale ''The Legendary Battle'', where every Ranger team to ever lead a season (including two from other planets, one from the future and one from an AlternateContinuity for some reason) come together to fight an Armada dwarfing the United Alliance of Evil declaring war on Earth. Most of the war is actually off-screen, with the Legendary Rangers fighting and rescuing people elsewhere while the season's own Mega Rangers fight the Emperor and high command; they all come together in time for the final battle against the last remnants of the army. This served as the 20th anniversary celebration, though the post-ChannelHop scheduling of the show delayed it to the 21st year.
to:
** The [[Series/PowerRangersMegaforce twenty-first season]] took the previous ''Rangers'' examples UpToEleven up to eleven with its GrandFinale ''The Legendary Battle'', where every Ranger team to ever lead a season (including two from other planets, one from the future and one from an AlternateContinuity for some reason) come together to fight an Armada dwarfing the United Alliance of Evil declaring war on Earth. Most of the war is actually off-screen, with the Legendary Rangers fighting and rescuing people elsewhere while the season's own Mega Rangers fight the Emperor and high command; they all come together in time for the final battle against the last remnants of the army. This served as the 20th anniversary celebration, though the post-ChannelHop scheduling of the show delayed it to the 21st year.
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** The 2016 event, ''[[Series/Invasion2016 Invasion!]]'', an adaption of the ''ComicBook/{{Invasion}}'' arc of the 1980's expanded the crossover by having play across all four shows: ''Series/{{Supergirl|2015}}'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' by having Barry Allen unite all the heroes he knows to stop an impending invasion from an alien race called the Dominators.
to:
** The 2016 event, ''[[Series/Invasion2016 Invasion!]]'', an adaption of the ''ComicBook/{{Invasion}}'' ''[[Comicbook/InvasionDCComics Invasion!]]'' arc of the 1980's expanded the crossover by having play across all four shows: ''Series/{{Supergirl|2015}}'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' by having Barry Allen unite all the heroes he knows to stop an impending invasion from an alien race called the Dominators.
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* ''Series/{{CSI}}'' has been known to cross storylines and characters between its various incarnations, as has the ''Franchise/LawAndOrder'' series. This most commonly takes place during sweeps.
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* ''Series/{{CSI}}'' ''Franchise/{{CSIVerse}}'' has been known to cross storylines and characters between its various incarnations, as has the ''Franchise/LawAndOrder'' series. This most commonly takes place during sweeps.sweeps.
** The most prominent ''[=CSI=]'' example is their "trilogy" from Nov of 2009, which concerned a nation-wide human trafficking ring Ray Langston was after due to young woman being kidnapped. It starts on ''Series/CSIMiami'' with "Bone Voyage," travels up the East Coast to ''Series/{{CSINY}}'' with "Hammer Down," and wraps up in Vegas with ''Series/{{CSI}}'''s "The Lost Girls."
** The most prominent ''[=CSI=]'' example is their "trilogy" from Nov of 2009, which concerned a nation-wide human trafficking ring Ray Langston was after due to young woman being kidnapped. It starts on ''Series/CSIMiami'' with "Bone Voyage," travels up the East Coast to ''Series/{{CSINY}}'' with "Hammer Down," and wraps up in Vegas with ''Series/{{CSI}}'''s "The Lost Girls."
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!!!'''In General:'''
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!!!'''By Network:'''
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!!!'''By Series:'''
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!!!'''In General:'''
* ''Series/{{CSI}}'' has been known to cross storylines and characters between its various incarnations, as has the ''Franchise/LawAndOrder'' series. This most commonly takes place during sweeps.
** There was in fact a ''Law & Order'' massive crossover in the works, involving a terrorist plot to attack NYC and several teams of detectives from different squads all working the case together. The idea got shelved after 9/11.
!!!'''By Network:'''
* During the winter of 1999, in line with its plans to air the {{Miniseries}} ''Series/StormOfTheCentury'', Creator/{{ABC}} had a raging winter storm strike all four of its [[SoapOpera soap operas]]. Fitting, as two were set in upstate Pennsylvania, while the other two (one of which was a SpinOff of the other) was set in upstate New York.
!!!'''By Series:'''
* ''Series/AmericanHorrorStoryApocalypse'' is effectively one of these for the ''Series/AmericanHorrorStory'' universe, as it combines several characters and story threads from different seasons (but especially ''[[Series/AmericanHorrorStoryMurderHouse Murder House]]'' and ''[[Series/AmericanHorrorStoryCoven Coven]]'') to reverse its titular apocalypse.
* Creator/TheCW's Series/{{Arrowverse}} has been doing these ever since ''Series/{{The Flash|2014}}'' premiered; it's not uncommon for characters to visit each other, but the ones that air each fall just before the winter break are advertised as big event TV. Originally they were just with the parent show, ''Series/{{Arrow}}'', they've gotten [[SerialEscalation bigger each year]] as more and more shows are added to the franchise. They are in order:
** The 2014 event, ''Series/FlashVsArrow'', where Flash and Arrow face off and visit each other's cities to understand each other better.
** The 2015 event, ''Series/HeroesJoinForces'' was used to promote the third Arrowverse show, ''Series/LegendsOfTomorrow'' by having Teams Arrow and Flash team-up to help Kendra Saunders and [[ComicBook/{{Hawkman}} Carter Hall]] escape the wrath of ComicBook/VandalSavage, the BigBad of ''Legends'' Season 1.
** The 2016 event, ''[[Series/Invasion2016 Invasion!]]'', an adaption of the ''ComicBook/{{Invasion}}'' arc of the 1980's expanded the crossover by having play across all four shows: ''Series/{{Supergirl|2015}}'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' by having Barry Allen unite all the heroes he knows to stop an impending invasion from an alien race called the Dominators.
** The 2017 event, ''Series/CrisisOnEarthX'' is even bigger. Whereas ''Invasion!'' was technically only a three part event (with ''Supergirl'' being just a [[RedSkiesCrossover tie-in]] to the main event), this crossover fully plays out over all four episodes, equally juggling the storylines of each show, as well as serving as a lead-in to ''WesternAnimation/FreedomFightersTheRay''. And it actually has lasting repercussions for the Arrowverse's future, as Barry and Iris get married, as do Oliver and Felicity, while Martin Stein is KilledOffForReal.
** The 2018 event, ''Series/{{Elseworlds|2018}}'', dials things back somewhat, "only" being a crossover between ''The Flash'', ''Arrow'', and ''Supergirl'', though in a surprising twist the [[Series/TheFlash1990 1990 Flash]] ended up making an appearance.[[note]] Legends of Tomorrow was left out for simplicity's sake since ''Crisis on Earth-X'' was a nightmare to coordinate around all four shows' schedule. [[/note]] That said, it is notably a BreatherEpisode compared to the previous year's crossover and is used to promote the then-upcoming''Series/{{Batwoman|2019}}''. Ultimately, it is just [[SequelHook a setup]] for the following year's event.
** The 2019-2020 event is ''Series/{{Crisis on Infinite Earths|2019}}'', having been foreshadowed steadily since ''The Flash'' Season 1 and sporadically throughout the other shows, it featured five episodes that span all recurrent Arrowverse series, including ''Supergirl'', ''Batwoman'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' (the last of these actually began its forthcoming season after the Crisis). This was the last time ''Arrow'' got to participate, as the show ended in 2020 and its final season focuses on {{Tonight|SomeoneDies}} TheHeroDies in the lead-up to and the aftermath of the Crisis. It is an adaptation of the classic [[ComicBook/CrisisOnInfiniteEarths comic of the same name]] AKA the TropeNamer. In addition to the return of 1990 Flash, it also features a cavalcade of guest and cameo appearances from other DC live-action adaptations from outside of the Arrowverse continuity, including Tim Burton's ''[[Film/Batman1989 Batman]]'', ''Series/{{Titans|2018}}'', the 1960s ''[[Film/Batman1966 Batman]]'' series, ''Series/{{Smallville}}'', [[CanonWelding a merger]] of ''Film/SupermanTheMovie'' and ''Film/SupermanReturns''[[note]]The Superman as portrayed by Creator/ChristopherReeve and Creator/BrandonRouth[[/note]], ''Series/{{Birds of Prey|2002}}'', ''Series/{{Lucifer|2016}}'', ''Series/{{Black Lightning|2018}}'', ''Series/{{Swamp Thing|2019}}'', ''Series/{{Doom Patrol|2019}}'' and the Franchise/DCExtendedUniverse. It also marks the debut of the titular character of ''Series/{{Stargirl|2020}}'', [[EarlyBirdCameo ahead of the series' premiere]] on the Creator/DCUniverse streaming service (which includes the aforementioned ''Titans'', ''Doom Patrol'' and ''Swamp Thing'')[[note]]A different version of ComicBook/{{Stargirl|DCComics}} previously appeared in Season 2 of ''Legends of Tomorrow'', played by Creator/SarahGrey[[/note]]. As with the comic book, this crossover has a ''huge'' impact on the franchise, as it ends up merging the ''Black Lightning'' Earth with Earth-38 (the universe where ''Supergirl'' is set) and Earth-1 (where the other four shows are set) into a single new reality.
%%* The 'Proof of Life' crossover between ''Series/TheBill'' and SOKO Leipzig.
* ''Series/TheDefenders2017'' is the self-contained type. It is an eight episode miniseries that sees [[Series/Daredevil2015 Matt Murdock]], Series/{{Jessica Jones|2015}}, Series/{{Luke Cage|2016}}, and [[Series/IronFist2017 Danny Rand]] team up to fight the Hand, a villainous organization built up in ''Daredevil'' season 2 and ''Iron Fist'' season 1. The crossover has lasting repercussions for the next phase of the Netflix shows, as [[spoiler:Matt's "death" in the climax, and subsequent turning up at a convent, sets up the third season of ''Daredevil'' to do a loose adaptation of the renowned ''ComicBook/DaredevilBornAgain'' storyline]].
* ''Series/DoctorWho'':
** Pre-revival, the show would occasionally have multi-Doctor special episodes. They had [[Recap/DoctorWhoS10E1TheThreeDoctors "The Three Doctors"]] (First/Second/Third), [[Recap/DoctorWho20thASTheFiveDoctors "The Five Doctors"]] (First/Second/Third/Fourth/Fifth), and [[Recap/DoctorWhoS22E4TheTwoDoctors "The Two Doctors"]] (Second/Sixth).
** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
** [[Recap/DoctorWho50thASTheDayOfTheDoctor "The Day of the Doctor"]] sees the Tenth, Eleventh, and retroactively introduced War Doctors work together to end the Time War. Eventually, [[spoiler:all ''13'' Doctors (including the 12th, yet to debut Doctor) come together to end the Time War and prevent the destruction of the Time Lords.]]
** [[Recap/DoctorWho2017CSTwiceUponATime "Twice Upon a Time"]] has the Twelfth Doctor team up with [[spoiler:his original incarnation, the First Doctor himself]].
* A rather famous "Hurricane Saturday" event that happened on ''Series/TheGoldenGirls'' and its spinoffs ''Series/EmptyNest'' and ''Nurses'' (''Nurses'' was technically a spinoff of ''Series/EmptyNest,'' but go with it.) A hurricane hit during ''The Golden Girls'' and ''Series/EmptyNest'' and the hospital of ''Nurses'' dealt with the aftermath. A similar even happened with a full moon, but that better fit as a CrossThrough.
* Ten years of ''Franchise/KamenRider''[='=]s Heisei era (and much later on, the franchise's 38 years up to that point) were [[MilestoneCelebration celebrated]] in ''Series/KamenRiderDecade'', where Decade (obviously the tenth) must travel across the ''Kamen Rider'' multiverse to save it from total destruction.
** The two-part GrandFinale of ''Series/KamenRiderWizard'' features all fourteen Heisei era Riders up until that point (as well as an EarlyBirdCameo appearance from Series/KamenRiderGaim) teaming up to prevent a new villain from unleashing all of the franchise's past [[MonsterOfTheWeek Monsters of the Week]] upon the Earth.
** The GrandFinale of the Heisei era is ''Series/KamenRiderZiO'', guest starring returning characters from previous series. Zi-O must avoid his fate of becoming an EvilOverlord in the future while preventing the antagonists from successfully grooming a substitute with the [[EvilKnockoff Another Riders]] they create, and the key to both parties' goals lie in the legendary Riders of the past.
* The three crossover episodes that ''Series/NCISNewOrleans'' has shared with its parent show--one of which was its BackDoorPilot--had a case beginning in Washington on ''Series/{{NCIS}}'' before evidence took them to New Orleans.
* ''Franchise/PowerRangers'' has done something like this a few times (not counting traditional two-season teamups), in what was originally meant to be the GrandFinale and as part of [[MilestoneCelebration Milestone Celebrations]].
** The first, ''Countdown to Destruction'' during [[Series/PowerRangersInSpace the sixth season]], featured Dark Specter and the United Alliance of Evil declaring war on the entire universe. While the Space Rangers are the main protagonists, making this a DownplayedTrope, the Aquitar Rangers and Zeo Gold are shown fighting elsewhere.
** Ten Red Rangers would later unite for a special mission in [[Series/PowerRangersWildForce the tenth season,]] to stop the Machine Empire's remaining generals from re-activating Zedd's war Zord Serpentera as part of the 10th anniversary celebration.
** The [[Series/PowerRangersMegaforce twenty-first season]] took the previous ''Rangers'' examples UpToEleven with its GrandFinale ''The Legendary Battle'', where every Ranger team to ever lead a season (including two from other planets, one from the future and one from an AlternateContinuity for some reason) come together to fight an Armada dwarfing the United Alliance of Evil declaring war on Earth. Most of the war is actually off-screen, with the Legendary Rangers fighting and rescuing people elsewhere while the season's own Mega Rangers fight the Emperor and high command; they all come together in time for the final battle against the last remnants of the army. This served as the 20th anniversary celebration, though the post-ChannelHop scheduling of the show delayed it to the 21st year.
* ''Space Squad: Space Sheriff Gavan Vs. Tokusou Sentai Dekaranger'' involves Geki/the new Gavan and the Dekarangers teaming up to fight an alliance between ''Series/MetalHeroes'' villains, with [[Series/KyojuuTokusouJuspion Madgallant]] as the movie's [[BigBad main villain]]. On top of this, the establishment of a space squad was done in response to [[Series/UchuuSentaiKyuranger another universe being dominated by evil]], to prevent such an event from happening again.
* ''Franchise/SuperSentai''. In the seasonal crossovers, the series from ''Series/BakuryuuSentaiAbaranger'' to ''Series/EngineSentaiGoOnger'' are nominally connected by mentions of the Dino House where one character from series A met a character from series B.
** ''Film/KamenRiderXSuperSentaiSuperheroTaisen'' is starting to look like this as well, with ''Decade'''s [[LegionOfDoom Dai-Shocker]] being ressurected, with their opposite number being the similarly-structured Dai-Zangyack Fleet [[spoiler:led by [=GokaiRed=] of the Gokaigers]]. Both the Super Sentai 199 and the All Riders are at the very middle, wondering just what is going on.
** The ''Super Hero Taisen'' series has become an annual tradition, though the focus has been shifting more and more toward the Rider side of things.
* ''Series/{{CSI}}'' has been known to cross storylines and characters between its various incarnations, as has the ''Franchise/LawAndOrder'' series. This most commonly takes place during sweeps.
** There was in fact a ''Law & Order'' massive crossover in the works, involving a terrorist plot to attack NYC and several teams of detectives from different squads all working the case together. The idea got shelved after 9/11.
!!!'''By Network:'''
* During the winter of 1999, in line with its plans to air the {{Miniseries}} ''Series/StormOfTheCentury'', Creator/{{ABC}} had a raging winter storm strike all four of its [[SoapOpera soap operas]]. Fitting, as two were set in upstate Pennsylvania, while the other two (one of which was a SpinOff of the other) was set in upstate New York.
!!!'''By Series:'''
* ''Series/AmericanHorrorStoryApocalypse'' is effectively one of these for the ''Series/AmericanHorrorStory'' universe, as it combines several characters and story threads from different seasons (but especially ''[[Series/AmericanHorrorStoryMurderHouse Murder House]]'' and ''[[Series/AmericanHorrorStoryCoven Coven]]'') to reverse its titular apocalypse.
* Creator/TheCW's Series/{{Arrowverse}} has been doing these ever since ''Series/{{The Flash|2014}}'' premiered; it's not uncommon for characters to visit each other, but the ones that air each fall just before the winter break are advertised as big event TV. Originally they were just with the parent show, ''Series/{{Arrow}}'', they've gotten [[SerialEscalation bigger each year]] as more and more shows are added to the franchise. They are in order:
** The 2014 event, ''Series/FlashVsArrow'', where Flash and Arrow face off and visit each other's cities to understand each other better.
** The 2015 event, ''Series/HeroesJoinForces'' was used to promote the third Arrowverse show, ''Series/LegendsOfTomorrow'' by having Teams Arrow and Flash team-up to help Kendra Saunders and [[ComicBook/{{Hawkman}} Carter Hall]] escape the wrath of ComicBook/VandalSavage, the BigBad of ''Legends'' Season 1.
** The 2016 event, ''[[Series/Invasion2016 Invasion!]]'', an adaption of the ''ComicBook/{{Invasion}}'' arc of the 1980's expanded the crossover by having play across all four shows: ''Series/{{Supergirl|2015}}'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' by having Barry Allen unite all the heroes he knows to stop an impending invasion from an alien race called the Dominators.
** The 2017 event, ''Series/CrisisOnEarthX'' is even bigger. Whereas ''Invasion!'' was technically only a three part event (with ''Supergirl'' being just a [[RedSkiesCrossover tie-in]] to the main event), this crossover fully plays out over all four episodes, equally juggling the storylines of each show, as well as serving as a lead-in to ''WesternAnimation/FreedomFightersTheRay''. And it actually has lasting repercussions for the Arrowverse's future, as Barry and Iris get married, as do Oliver and Felicity, while Martin Stein is KilledOffForReal.
** The 2018 event, ''Series/{{Elseworlds|2018}}'', dials things back somewhat, "only" being a crossover between ''The Flash'', ''Arrow'', and ''Supergirl'', though in a surprising twist the [[Series/TheFlash1990 1990 Flash]] ended up making an appearance.[[note]] Legends of Tomorrow was left out for simplicity's sake since ''Crisis on Earth-X'' was a nightmare to coordinate around all four shows' schedule. [[/note]] That said, it is notably a BreatherEpisode compared to the previous year's crossover and is used to promote the then-upcoming''Series/{{Batwoman|2019}}''. Ultimately, it is just [[SequelHook a setup]] for the following year's event.
** The 2019-2020 event is ''Series/{{Crisis on Infinite Earths|2019}}'', having been foreshadowed steadily since ''The Flash'' Season 1 and sporadically throughout the other shows, it featured five episodes that span all recurrent Arrowverse series, including ''Supergirl'', ''Batwoman'', ''The Flash'', ''Arrow'', and ''Legends of Tomorrow'' (the last of these actually began its forthcoming season after the Crisis). This was the last time ''Arrow'' got to participate, as the show ended in 2020 and its final season focuses on {{Tonight|SomeoneDies}} TheHeroDies in the lead-up to and the aftermath of the Crisis. It is an adaptation of the classic [[ComicBook/CrisisOnInfiniteEarths comic of the same name]] AKA the TropeNamer. In addition to the return of 1990 Flash, it also features a cavalcade of guest and cameo appearances from other DC live-action adaptations from outside of the Arrowverse continuity, including Tim Burton's ''[[Film/Batman1989 Batman]]'', ''Series/{{Titans|2018}}'', the 1960s ''[[Film/Batman1966 Batman]]'' series, ''Series/{{Smallville}}'', [[CanonWelding a merger]] of ''Film/SupermanTheMovie'' and ''Film/SupermanReturns''[[note]]The Superman as portrayed by Creator/ChristopherReeve and Creator/BrandonRouth[[/note]], ''Series/{{Birds of Prey|2002}}'', ''Series/{{Lucifer|2016}}'', ''Series/{{Black Lightning|2018}}'', ''Series/{{Swamp Thing|2019}}'', ''Series/{{Doom Patrol|2019}}'' and the Franchise/DCExtendedUniverse. It also marks the debut of the titular character of ''Series/{{Stargirl|2020}}'', [[EarlyBirdCameo ahead of the series' premiere]] on the Creator/DCUniverse streaming service (which includes the aforementioned ''Titans'', ''Doom Patrol'' and ''Swamp Thing'')[[note]]A different version of ComicBook/{{Stargirl|DCComics}} previously appeared in Season 2 of ''Legends of Tomorrow'', played by Creator/SarahGrey[[/note]]. As with the comic book, this crossover has a ''huge'' impact on the franchise, as it ends up merging the ''Black Lightning'' Earth with Earth-38 (the universe where ''Supergirl'' is set) and Earth-1 (where the other four shows are set) into a single new reality.
%%* The 'Proof of Life' crossover between ''Series/TheBill'' and SOKO Leipzig.
* ''Series/TheDefenders2017'' is the self-contained type. It is an eight episode miniseries that sees [[Series/Daredevil2015 Matt Murdock]], Series/{{Jessica Jones|2015}}, Series/{{Luke Cage|2016}}, and [[Series/IronFist2017 Danny Rand]] team up to fight the Hand, a villainous organization built up in ''Daredevil'' season 2 and ''Iron Fist'' season 1. The crossover has lasting repercussions for the next phase of the Netflix shows, as [[spoiler:Matt's "death" in the climax, and subsequent turning up at a convent, sets up the third season of ''Daredevil'' to do a loose adaptation of the renowned ''ComicBook/DaredevilBornAgain'' storyline]].
* ''Series/DoctorWho'':
** Pre-revival, the show would occasionally have multi-Doctor special episodes. They had [[Recap/DoctorWhoS10E1TheThreeDoctors "The Three Doctors"]] (First/Second/Third), [[Recap/DoctorWho20thASTheFiveDoctors "The Five Doctors"]] (First/Second/Third/Fourth/Fifth), and [[Recap/DoctorWhoS22E4TheTwoDoctors "The Two Doctors"]] (Second/Sixth).
** The two-part Series 4 finale, [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth"]]/[[Recap/DoctorWhoS30E13JourneysEnd "Journey's End"]], crosses over with spinoffs ''Series/{{Torchwood}}'' and ''Series/TheSarahJaneAdventures'', and also brings in almost all of the Doctor's companions to appear in the revived series to date. (Although it should be noted that this did not have any on-screen content or long-term consequences in either of the spin-off shows.)
** [[Recap/DoctorWho50thASTheDayOfTheDoctor "The Day of the Doctor"]] sees the Tenth, Eleventh, and retroactively introduced War Doctors work together to end the Time War. Eventually, [[spoiler:all ''13'' Doctors (including the 12th, yet to debut Doctor) come together to end the Time War and prevent the destruction of the Time Lords.]]
** [[Recap/DoctorWho2017CSTwiceUponATime "Twice Upon a Time"]] has the Twelfth Doctor team up with [[spoiler:his original incarnation, the First Doctor himself]].
* A rather famous "Hurricane Saturday" event that happened on ''Series/TheGoldenGirls'' and its spinoffs ''Series/EmptyNest'' and ''Nurses'' (''Nurses'' was technically a spinoff of ''Series/EmptyNest,'' but go with it.) A hurricane hit during ''The Golden Girls'' and ''Series/EmptyNest'' and the hospital of ''Nurses'' dealt with the aftermath. A similar even happened with a full moon, but that better fit as a CrossThrough.
* Ten years of ''Franchise/KamenRider''[='=]s Heisei era (and much later on, the franchise's 38 years up to that point) were [[MilestoneCelebration celebrated]] in ''Series/KamenRiderDecade'', where Decade (obviously the tenth) must travel across the ''Kamen Rider'' multiverse to save it from total destruction.
** The two-part GrandFinale of ''Series/KamenRiderWizard'' features all fourteen Heisei era Riders up until that point (as well as an EarlyBirdCameo appearance from Series/KamenRiderGaim) teaming up to prevent a new villain from unleashing all of the franchise's past [[MonsterOfTheWeek Monsters of the Week]] upon the Earth.
** The GrandFinale of the Heisei era is ''Series/KamenRiderZiO'', guest starring returning characters from previous series. Zi-O must avoid his fate of becoming an EvilOverlord in the future while preventing the antagonists from successfully grooming a substitute with the [[EvilKnockoff Another Riders]] they create, and the key to both parties' goals lie in the legendary Riders of the past.
* The three crossover episodes that ''Series/NCISNewOrleans'' has shared with its parent show--one of which was its BackDoorPilot--had a case beginning in Washington on ''Series/{{NCIS}}'' before evidence took them to New Orleans.
* ''Franchise/PowerRangers'' has done something like this a few times (not counting traditional two-season teamups), in what was originally meant to be the GrandFinale and as part of [[MilestoneCelebration Milestone Celebrations]].
** The first, ''Countdown to Destruction'' during [[Series/PowerRangersInSpace the sixth season]], featured Dark Specter and the United Alliance of Evil declaring war on the entire universe. While the Space Rangers are the main protagonists, making this a DownplayedTrope, the Aquitar Rangers and Zeo Gold are shown fighting elsewhere.
** Ten Red Rangers would later unite for a special mission in [[Series/PowerRangersWildForce the tenth season,]] to stop the Machine Empire's remaining generals from re-activating Zedd's war Zord Serpentera as part of the 10th anniversary celebration.
** The [[Series/PowerRangersMegaforce twenty-first season]] took the previous ''Rangers'' examples UpToEleven with its GrandFinale ''The Legendary Battle'', where every Ranger team to ever lead a season (including two from other planets, one from the future and one from an AlternateContinuity for some reason) come together to fight an Armada dwarfing the United Alliance of Evil declaring war on Earth. Most of the war is actually off-screen, with the Legendary Rangers fighting and rescuing people elsewhere while the season's own Mega Rangers fight the Emperor and high command; they all come together in time for the final battle against the last remnants of the army. This served as the 20th anniversary celebration, though the post-ChannelHop scheduling of the show delayed it to the 21st year.
* ''Space Squad: Space Sheriff Gavan Vs. Tokusou Sentai Dekaranger'' involves Geki/the new Gavan and the Dekarangers teaming up to fight an alliance between ''Series/MetalHeroes'' villains, with [[Series/KyojuuTokusouJuspion Madgallant]] as the movie's [[BigBad main villain]]. On top of this, the establishment of a space squad was done in response to [[Series/UchuuSentaiKyuranger another universe being dominated by evil]], to prevent such an event from happening again.
* ''Franchise/SuperSentai''. In the seasonal crossovers, the series from ''Series/BakuryuuSentaiAbaranger'' to ''Series/EngineSentaiGoOnger'' are nominally connected by mentions of the Dino House where one character from series A met a character from series B.
** ''Film/KamenRiderXSuperSentaiSuperheroTaisen'' is starting to look like this as well, with ''Decade'''s [[LegionOfDoom Dai-Shocker]] being ressurected, with their opposite number being the similarly-structured Dai-Zangyack Fleet [[spoiler:led by [=GokaiRed=] of the Gokaigers]]. Both the Super Sentai 199 and the All Riders are at the very middle, wondering just what is going on.
** The ''Super Hero Taisen'' series has become an annual tradition, though the focus has been shifting more and more toward the Rider side of things.
