History Series / ToeiUniverse

** ''Series/HikoninSentaiAkibaranger'' (2012-2013): Broadcast over two seasons, ''Akibaranger'' is an "unofficial" Sentai spin-off which takes place in a world where ''Super Sentai'' is but a fictional television franchise, but is distinct from the real world in that the ''Space Sheriff'' franchise is an anime franchise named ''Galactic Sheriff'' amongst other differences. The ''Akibaranger'' world itself is in its own little multiverse alongside the Delusion World where the Akibarangers fight their battles, the world of Saburo Hatte (the writer).

* ''Series/GoGoSentaiBoukenger'' (2006-2007): Crossed over with the first 29 Super Sentai in ''Boukenger vs. Super Sentai''.

* ''Series/KaizokuSentaiGokaiger'' (2011-2012): The 35th anniversary series, ''Gokaiger''’s setting is a world where the first 34 Super Sentai all exist, with the Gokaigers inheriting the powers and {{Continuity Cameo}}s galore. Started the trend of ''Metal Hero'' crossovers by doing so with ''Gavan'' (the first Metal Hero) in ''Gokaiger vs. Gavan'', which also introduces the team from ''Go-Busters''.

** The 20th anniversary film ''Kamen Rider 555 20th: Paradise Regained'' (2023) is set exclusively in the continuity of the show, ignoring the FullyAbsorbedFinale for ''555'' depicted in the ''Kamen Rider 4'' miniseries mentioned below.

** ''Film/KamenRiderG'' (2009): An AffectionateParody short which features Decade (and the first nine Heisei Riders) dropping in on the eponymous hero via a dimensional wall. The eponymous Rider fights against the organization Shade which, due to a reuse of costumes, has its ranks made up of modified humans who assume the form of Worms from ''Kabuto'', whilst G rides V3's Hurricane bike from ''Kamen Rider The Next''. A Neo-Shade appears in ''Series/KamenRiderDrive''. G later cameos in TheMovie for ''Kamen Rider Zi-O'' alongside other "Lost Heisei Riders". As in the real world, ''Super Sentai'' exists as a TV Asahi production in this reality as evidenced by the appearance of a poster for ''Gekiranger vs. Go-Onger''.

* ''Series/KamenRiderDouble'' (2009-10): This series introduces Foundation X, an evil organization which resurfaces to haunt later shows. Crossed over with ''Decade'' in ''Movie War 2010''. ''Double'' itself provides a SequelHook to ''OOO'' with Foundation X mentioning the Core Medal in its antepenultimate episode, as well as starting the tradition of the new Rider making an EarlyBirdCameo in TheMovie, first with Double himself debuting in Decade’s movie, then with the appearance of OOO in Double’s movie (which fits into ''Double'''s continuity).
** ''Manga/FuutoPI'': A manga SequelSeries [[SequelInAnotherMedium in Another Medium]] to ''Double''. Akiko’s maternity leave in the first chapter sets it after her wedding in ''Movie War Core'' and the ''Double Retruns: Accel'' V-Cinema, but before Accel’s phone conversation with their daughter in the ''Drive Saga: Chaser'' V-Cinema.
* ''Series/KamenRiderOOO'' (2010-11): Crossed over with ''Double'' in ''Movie War Core''. Provides a SequelHook to ''Fourze'' by having two supporting characters make TheCameo in the final episode, while TheMovie hosts the debut of Fourze himself.
* ''Series/KamenRiderFourze'' (2011-12): The second episode has Tomoko Nozawa introduce Fourze to the concept of a Kamen Rider by showing him battle footage of Rider #1 from the original series, Super-1, and Kuuga, and an article about the destruction of Fuuto Tower from ''Double''’s movie. Crossed over with ''OOO'', ''Double'', and the original Seven Legendary Riders in ''Movie War Mega Max'' to fight against Foundation X. Provides a SequelHook to ''Wizard'' by having him make TheCameo out of his suit in the finale, while TheMovie hosts the debut of Wizard as a Rider.
* ''Series/KamenRiderWizard'' (2012-13): Crossed over with ''Fourze'', ''OOO'', and ''Double'' in ''Movie War Ultimatum''. Closes with a TwoPartEpisode in which Wizard ([[TheSixthRanger and Beast]]) are transported to an AlternateUniverse along with the first thirteen Heisei Rider protagonists and the new guy, Gaim.
* ''Series/KamenRiderGaim'' (2013-14): Crossed over with ''Wizard'' in the ''Sengoku Movie Battle''. Began the tradition of ''Rider'' and ''Sentai'' having crossovers to promote the new spring movie, by having a crossover with ''Ressha Sentai [=ToQger=]'' which features a surprise cameo by Narutaki from ''Decade'' to promote ''Kamen Rider Taisen''. The TieInNovel that concludes the narrative threads from the ''Gaim Gaiden'' V-Cinemas incorporates elements from the ''Wizard'' & ''Drive'' crossovers and the ''Kamen Rider Taisen'' movie, and features a cameo from Tsukasa Kadoya of ''Decade'' showing Mitsuzane the heroes and monsters of the other Heisei Rider seasons up to ''Drive''.
* ''Series/KamenRiderDrive'' (2014-15): ''Drive'' features, albeit in a minor capacity, a human terrorist organization known as Neo-Shade, who are said to date back to 2009, alluding to the bad guys from ''G''. Crossed over with ''Gaim'' in ''Movie War Full Throttle'', which also had a FreezeFrameBonus in the background depicting a landmark from ''Double''. Features an EarlyBirdCameo by Ghost in TheMovie as well as the final two episodes, the last of which is called back to early on in ''Ghost'' proper. Also crossed over with a ''Double'' character in the ''Drive Saga: Chaser'' V-Cinema. Crossed over with ''Shuriken Sentai Ninninger'' to promote ''Super Hero Taisen GP'' (though the special notably treats ''Drive'' and ''Ninninger'' as being in separate universes). Said movie's sequel miniseries ''Kamen Rider 4'' crosses over with ''Den-O'' and acts as a FullyAbsorbedFinale to ''555''.
* ''Series/KamenRiderGhost'' (2015-16): Crossed over with ''Drive'' in ''Super Movie War Genesis''. Crossed over with the original ''Kamen Rider'' in ''Kamen Rider 1'', which was promoted by a crossover with ''Doubutsu Sentai Zyuohger'' and a miniseries featuring villains from the previous Heisei Phase 2 seasons. Features an EarlyBirdCameo by Ex-Aid in TheMovie, his dark counterpart Genm in the penultimate episode, and both Ex-Aid & Genm in the finale. Notably, the TieInNovel handwaves the continuity errors in ''Super Movie War Genesis'' as the events of that movie taking place in an AlternateTimeline.
** ''Series/KamenRiderAmazons'' (2016, 2017): ''Amazons'' is a streaming series, visually derived from ''Amazon'' but sharing no continuity with it. It is confirmed by [[Main/WordOfGod producer Shinichiro Shirakura]] to take place in an alternate reality to the prime ''Kamen Rider'' universe, though their inclusion in the same multiverse is acknowledged by the appearance of ''Amazons'' characters in ''Chou Super Hero Taisen''. The ''Amazons'' characters also appear in the ''Zi-O'' stage show set after TheMovie's AlternateTimeline, further establishing its place in the multiverse.
* ''Series/KamenRiderExAid'' (2016-17): Crossed over with ''Ghost'', ''Drive'', ''Gaim'', and ''Wizard'' in ''Heisei Generations''. The ''Kamen Rider Brave'' special features Brave fighting a Beast Rider Squad of animal-based Riders from ''Kabuto'', ''Kiva'', ''Wizard'', and ''Ryuki'' led by ''Ryuki''’s Ouja, with King Dark from ''Kamen Rider X'' as their nominal master and Foundation X as TheManBehindTheMan to him. Promoted ''Chou Super Hero Taisen'' with a brief ''Uchu Sentai Kyuranger'' cameo in an episode (the movie itself inexplicably treats ''Kyuranger'' as taking place in the same universe despite all other media treating ''Kyuranger'' as set in an alternate universe, see below), and crosses over with ''Agito'', ''Gaim'', and ''Blade'' in said movie's sequel miniseries ''Kamen Sentai Gorider''. Features an EarlyBirdCameo by Build in TheMovie and the penultimate episode, with both appearances leading directly into the next crossover movie's plot.
* ''Series/KamenRiderBuild'' (2017-18): Uniquely, ''Build'' sets itself in an AlternateUniverse to the prime ''Kamen Rider'' reality, as seen when it crosses over with ''Ex-Aid'', ''Ghost'', ''Gaim'', ''Fourze'', and ''OOO'' in ''Heisei Generations FINAL'' via dimensional travel to fight a MadScientist’s AllianceOfAlternates, one of whom is a Foundation X member. Features an EarlyBirdCameo by Zi-O in TheMovie and a tease of one of ''Zi-O''’s {{Transformation Trinket}}s in the final episode. According to [[WordOfGod producer Takahito Ōmori]], the finale concluding with [[spoiler:the World of Build becoming a MergedReality with the main universe into a New World]] was intended to more easily facilitate future crossovers.
* ''Series/KamenRiderZiO'' (2018-19): StealthSequel to ''Decade'', crossing over with all prior Heisei era seasons in various tribute episodes and movies, including ''Build'' in ''Heisei Generations FOREVER''[[note]], which also functions as a tribute episode dedicated to ''Double'', ''Den-O'', and particularly ''Kuuga''[[/note]], and is a RealWorldEpisode. TheMovie was a tribute episode for ''Drive'', as well as "Lost Heisei Riders" [[note]]i.e. ''Black RX'' which began in the Showa era but finished in the Heisei era, the three films from the 90's, and ''Amazons''[[/note]], and had a cameo from the protagonist of ''Kamen Norider''[[note]]WordOfGod claims these movies are CanonDiscontinuity and split into an AlternateTimeline's ending respectively, but their effect on the status quo and narrative is referenced just enough that BroadStrokes versions of their events must have occurred in the series[[/note]]. The finale suggests a [[spoiler:CosmicRetcon splitting the twenty Heisei era seasons into their own worlds as the natural state of being]], but continues to treat all Riders as sharing a universe in post-series crossovers.

* ''Series/KamenRiderZeroOne'' (2019-20): Crossed over with ''Zi-O'' in ''Reiwa: The First Generation'', which also functions as a thematic tribute episode to the original ''Kamen Rider'', [[spoiler:and which indicates the twenty-one universes the World of Zi-O split into at the end of the previous season have become a MergedReality once again]]. Also crossed over with ''Ex-Aid'' in the ''Kamen Rider Genms'' specials, with elements of ''555'' in ''Smart Brain and the 1000% Crisis'', the latter ending with a SequelHook that leads into ''Kamen Rider Outsiders''.

* ''Series/KamenRiderSaber'' (2020-21): Crossed over with ''Ghost'' in the ''Kamen Rider Saber × Ghost'' and ''Kamen Rider Specter × Blades'' specials, the latter ending with a SequelHook that leads into ''Kamen Rider Outsiders''. Also had a brief cameo from ''Gaim'' characters in an episode to promote ''Gaim Gaiden''. Crossed over with ''Kikai Sentai Zenkaiger'' to promote the ''Superhero Senki'' movie. One of the writers makes a CreatorCameo in the penultimate episode during an award ceremony for Touma’s novel ''Eternal Story'' as a [=HumaGear=], connecting to ''Zero-One''[[note]]''Saber'' previously began with a prologue special that functioned as a RecapEpisode for ''Zero-One'' up to that point, but the prologue itself was out of continuity and its events were reimagined in the first episode of ''Saber'' proper[[/note]]. The characters of ''Revice'' appear in the final episode following their cameo in ''Superhero Senki''.
* ''Series/KamenRiderRevice'' (2021-22): Celebrates the 50th anniversary of the franchise with the main gimmick being Legend Rider devices called Vistamps and the scientist who created the Riders’ power system having been inspired by the past Kamen Riders he is a fanboy of in-universe. [[WordOfGod Producer Taki Mochizuki]] states that ''Revice'' is set in a world that includes all previous Riders much like ''Kaizoku Sentai Gokaiger'' below in order to easily facilitate crossovers such as the aforementioned final episode of ''Saber''[[note]]Though early promotional material indicated the series was initially planned to be set in a "real world" where prior ''Kamen Rider'' seasons were a ShowWithinAShow like ''Heisei Generations FOREVER'' did[[/note]]. Crossed over with ''Saber'' and the original ''Kamen Rider'' in the ''Beyond Generations'' movie. The miniseries ''Kamen Rider Revice: The Mystery'' features characters from ''555'', ''Drive'', ''Gaim'', and ''Double''. The ''Kamen Rider Jeanne & Kamen Rider Aguilera with Girls Remix'' miniseries features returning heroines from ''Saber'', ''Zero-One'', ''Zi-O'', ''Build'', ''Ex-Aid'', ''Ghost'', ''Wizard'', and ''Double'', as well as elements of ''Stronger''. Provides a SequelHook to ''Geats'' by having him make TheCameo in TheMovie and final episode, the latter of which is called back to in ''Movie Battle Royale''.

* ''Series/KamenRiderGeats'' (2022-23): Crossed over with ''Revice'' and ''Ryuki'' in ''Movie Battle Royale'', and with Ouja from ''Ryuki'' in the Hyper Battle DVD. The fight between Vice and Buffa on a train in the former has FreezeFrameBonus advertisements for companies and products from past seasons, including Touma’s novels from ''Saber'', Genm Corporation games from ''Ex-Aid'', caffè nascita from ''Build'', ORE Journal from ''Ryuki'', and Hiden Intelligence and the amusement park from ''Zero-One''. One of the ''Geats Extra'' web-exclusive specials teams up Kamen Rider Tycoon with the characters of the ''RIDER TIME: Kamen Rider Shinobi'' miniseries from ''Zi-O'', featuring other ninja-based Riders such as Kenzan from ''Saber'', Fuuma from the ''Ex-Aid'' movie, and ZX. Provides as SequelHook to ''Gotchard'' with an EarlyBirdCameo in TheMovie and finale. The ''「Who is MELO?」'' novel tie-in to the movie alludes to elements of ''Gaim''.
* ''Series/KamenRiderGotchard'' (2023-24): Crossed over with ''Geats'' in ''The Winter Movie''. The titular Rider of the ''Kamen Rider Legend'' miniseries can transform into past Riders akin to Decade, who cameos in a flashback scene. The miniseries also features elements of ''Zi-O''.

* ''Series/NinpuuSentaiHurricaneger'' (2002-2003): Crossed over with ''Gaoranger'' in ''Hurricaneger vs. Gaoranger''. The ''10 YEARS AFTER'' movie appears to be set exclusively in the continuity of the television series and contradicts the ''Hurricaneger'' characters’ appearances in other crossovers.
* ''Series/BakuryuuSentaiAbaranger'' (2003-2004): Crossed over with ''Hurricanger'' in ''Abaranger vs. Hurricaneger''. The Dino House curry restaurant used as the team’s HomeBase is referenced in several later crossover movies as a place where supporting characters from the featured seasons have met and befriended each other. The 20th anniversary reunion movie appears to be set primarily in the continuity of the television series and contradicts the ''Abaranger'' characters’ appearances in most other crossovers, but was promoted by a special crossing over with ''Donbrothers''.

* ''Series/EngineSentaiGoOnger'' (2008-2009): Crossed over with ''Gekiranger'' in ''Go-Onger vs. Gekiranger''. The ''10 YEARS GRANDPRIX'' movie implicitly acknowledges other crossovers by mentioning Speedor & [=BearRV=]’s marriage established in the ''Gokaiger'' tribute episodes and a BrickJoke from ''Shinkenger vs. Go-Onger''.
* ''Series/SamuraiSentaiShinkenger'' (2009-2010): Crossed over with ''Go-Onger'' in ''Shinkenger vs. Go-Onger'', which also starts a new tradition of EarlyBirdCameo by introducing the team from ''Goseiger''. Was one of the worlds of TheMultiverse visited in ''Kamen Rider Decade'', which treated the World of Shinkenger as one without Riders and the introduction of a Rider as an anomaly.

* ''Series/TokumeiSentaiGobusters'' (2012-2013): Guest stars the hero from ''Film/SpaceSheriffGavanTheMovie'' in a TwoPartEpisode. Crossed over with ''Gokaiger'' in ''Go-Busters vs. Gokaiger'', which also introduces the team from ''Kyoryuger''.
** ''Series/HikoninSentaiAkibaranger'' (2012-2013): Broadcast over two seasons, ''Akibaranger'' is an "unofficial" Sentai spin-off which takes place in a world where ''Super Sentai'' is but a fictional television franchise, but is distinct from the real world in that the ''Space Sheriff'' franchise is an anime franchise named ''Galactic Sheriff'' amongst other differences. The ''Akibaranger'' world itself is in its own little multiverse alongside the Delusion World where the Akibarangers fight their battles, the world of Saburo Hatte (the writer). Also, a LeaningOnTheFourthWall reference in ''[[Film/SpaceSheriffGavanVsTokusouSentaiDekaranger Gavan vs. Dekaranger]]'' could suggest that ''Akibaranger'' has influence on the prime ''Super Sentai'' universe itself, which is further implied in ''Superhero Senki'' via the Zenkaigers using an Akibaranger Sentai Gear, indicating that ''Akibaranger'' is a world within the ''Zenkaiger'' multiverse.

* ''Series/ResshaSentaiToQger'' (2014-2015): Crossed over with ''Kyoryuger'' in ''[=ToQger=] vs. Kyoryuger'', which also introduces the team from ''Ninninger''. There are small references to ''Go-Busters'' and ''Gekiranger'' in a few episodes. Crossed over with ''Kamen Rider Gaim'' to promote the ''Kamen Rider Taisen'' movie.
* ''Series/ShurikenSentaiNinninger'' (2015-2016): Uniquely, ''Ninninger'' hosted several guest appearances from legendary heroes in its televised run (including characters from ''Kakuranger'', ''Hurricaneger'', ''Goranger'', ''Magiranger'', and even ''Series/SekaiNinjaSenJiraiya''). Crossed over with ''[=ToQger=]'' in ''Ninninger vs. [=ToQger=]'', which also introduces the team from ''Zyuohger''. The crossover with ''Kamen Rider Drive'' to promote ''Super Hero Taisen GP'' notably treats ''Ninninger'' as taking place in a separate universe from ''Drive''.
* ''Series/DoubutsuSentaiZyuohger'' (2016-2017): Guest stars the team from ''Gokaiger'' in a TwoPartEpisode to celebrate the 1999th and 2000th episodes of the franchise. Crossed over with ''Ninninger'' (plus TheCameo from the first 38 Super Sentai) in ''Zyuohger vs. Ninninger'', which also introduces the team from ''Kyuranger''. Crossed over with ''Kamen Rider Ghost'' to promote the ''Kamen Rider 1'' movie.

* ''Series/KaitouSentaiLupinrangerVsKeisatsuSentaiPatranger'' (2018-2019): Crossed over with ''Kyuranger'' (and a cameo from the SixthRanger of ''Zyuohger'' to [[BreakingTheFourthWall complain about his season]] not getting a proper crossover with the next) in ''Lupinranger VS Patranger VS Kyuranger'', which involves dimensional travel consistent with ''Kyuranger''’s AlternateUniverse status. The finale shows Shiho Ichinose creating an in-universe manga ''Good Three'' based on the Lupinrangers that becomes a ShowWithinAShow read by other characters from later seasons, such as ''Kiramager''.

* ''Series/MashinSentaiKiramager'' (2020-2021): Crossed over with ''Ryusoulger'' in ''Kiramager vs. Ryusoulger'' and a one-episode crossover with supporting characters from ''Gekiranger''.
* ''Series/KikaiSentaiZenkaiger'' (2021-2022): Like ''Kamen Rider Decade'', ''Zenkaiger'' uses the concept of TheMultiverse. Like ''Kamen Rider Zi-O'', ''Zenkaiger'' treats all previous seasons as taking place in their own individual worlds, though the extent to which they are separate is currently unclear, though ''Gokaiger'' is seemingly treated as one CrossoverAlternateUniverse for the first 35 seasons, [[spoiler:and a FreezeFrameBonus during the season’s endgame implies the existence of another CrossoverAlternateUniverse called Super Sentaitopia that may be the setting of every prior season sans ''Kyuranger'']]. Also crossed over with ''Kamen Rider Saber'' to promote ''Superhero Senki''. Introduces the Red Ranger of the next season ''Donbrothers'' in episode 42. Crossed over with ''Kiramager'' in ''Zenkaiger vs. Kiramager vs. Senpaiger'', with the Senpaiger team consisting of Red Rangers from ''Gokaiger'' to ''Ryusoulger''. The team’s SixthRanger Twokaiser has a crossover with ''Gokaiger'' in ''Twokaizer × Gokaiger ~June Bride is Tanuki Flavor~''.

* ''Series/AvataroSentaiDonbrothers'' (2022-2023): For the first time since the transition from ''Denziman'' to ''Sun Vulcan'', ''Donbothers'' is a SequelSeries to its immediate predecessor ''Zenkaiger'', with the Donbrothers’ Avataro Gears being functionally successors to the Zenkaigers’ Sentai Gears, and the Red Ranger [=DonMomotaro=] making his debut in episode 42 of ''Zenkaiger''. An AlternateSelf of ''Zenkaiger''’s lead hero Kaito Goshikida appears as the Donbrothers’ MissionControl, and is able to transform into Zenkaizer Black, a PaletteSwap of the original Zenkaizer. Crossed over with ''Zenkaiger'' directly in ''Donbrothers vs. Zenkaiger''. Also had a web special team up with the Senpaigers to promote the aforementioned ''Zenkaiger vs. Kiramager vs. Senpaiger'' movie. Had web-exclusive crossovers to promote the 20th anniversary specials of ''Hurricaneger'' and ''Abaranger''.
* ''Series/OhsamaSentaiKingOhger'' (2023-2024): The main mecha, King-Ohger, makes its debut in episode 45 of ''Donbrothers''. ''King-Ohger'' takes place in its own mirror version of Earth called Tikyū as the setting and the team being monarchs from the planet’s kingdoms. #31-32 is a two-part crossover with ''Kyoryuger'' which confirms that, unlike ''Kyuranger'', ''King-Ohger'' is still set within the prime ''Super Sentai'' universe, just on a different planet, the natives of Tikyū being descended from Earthlings. Crossed over with ''Donbrothers'' in ''King-Ohger vs. Donbrothers'' and with ''Kyoryuger'' again in ''King-Ohger vs. Kyoryuger''.

* ''Series/KamenRiderGotchard'' (2023-24): Crossed over with ''Geats'' in 'The Winter Movie''. The titular Rider of the ''Kamen Rider Legend'' miniseries can transform into past Riders akin to Decade, who appears in a flashback scene. The miniseries also features elements of ''Zi-O''.

* ''Series/KamenRiderGeats'' (2022-23): Crossed over with ''Revice'' and ''Ryuki'' in ''Movie Battle Royale'', and with Ouja from ''Ryuki'' in the Hyper Battle DVD. The fight between Vice and Buffa on a train in the former has FreezeFrameBonus advertisements for companies and products from past seasons, including Touma’s novels from ''Saber'', Genm Corporation games from ''Ex-Aid'', caffè nascita from ''Build'', ORE Journal from ''Ryuki'', and Hiden Intelligence and the amusement park from ''Zero-One''. One of the ''Geats Extra'' web-exclusive specials teams up Kamen Rider Tycoon with the characters of the ''RIDER TIME: Kamen Rider Shinobi'' miniseries from ''Zi-O'', featuring other ninja-based Riders such as Kenzan from ''Saber'', Fuuma from the ''Ex-Aid'' movie, and ZX. Provides as SequelHook to ''Gotchard'' with an EarlyBirdCameo in TheMovie and finale.

* ''Series/BakuryuuSentaiAbaranger'' (2003-2004): Crossed over with ''Hurricanger'' in ''Abaranger vs. Hurricaneger''. The Dino House curry restaurant used as the team’s HomeBase is referenced in several later crossover movies as a place where supporting characters from the featured seasons have met and befriended each other.

* ''Series/OhsamaSentaiKingOhger'' (2023-): The main mecha, King-Ohger, makes its debut in episode 45 of ''Donbrothers''. ''King-Ohger'' takes place in its own mirror version of Earth called Tikyū as the setting and the team being monarchs from the planet’s kingdoms. #31-32 is a two-part crossover with ''Kyoryuger'' which confirms that, unlike ''Kyuranger'', ''King-Ohger'' is still set within the prime ''Super Sentai'' universe, just on a different planet, the natives of Tikyū being descended from Earthlings.

* A special crossover miniseries called ''Series/KamenRiderOutsiders'' follows up on the {{Sequel Hook}}s from the ends of ''Kamen Rider Specter × Blades'' and the ''Kamen Rider Genms'' specials, with Riders and characters from ''Ryuki'', ''Decade'', ''Blade'', ''Drive'', ''Revice'', and ''Den-O'' returning as well. Continuing the narrative from the end of ''Smart Brain and the 1000% Crisis'', Foundation X attempts to resurrect and recruit various evil Riders throughout the franchise's multiverse to complete Project Outsiders, a LegionOfDoom assembled to counter the KnightTemplar AI Zein.
* ''Series/KamenRiderGeats'' (2022-23): Crossed over with ''Revice'' and ''Ryuki'' in ''Movie Battle Royale'', and with Ouja from ''Ryuki'' in the Hyper Battle DVD. The fight between Vice and Buffa on a train in the former has FreezeFrameBonus advertisements for companies and products from past seasons, including Touma’s novels from ''Saber'', Genm Corporation games from ''Ex-Aid'', caffè nascita from ''Build'', ORE Journal from ''Ryuki'', and Hiden Intelligence and the amusement park from ''Zero-One''. One of the ''Geats Extra'' web-exclusive specials teams up Kamen Rider Tycoon with the characters of the ''RIDER TIME: Kamen Rider Shinobi'' miniseries from ''Zi-O'', featuring other ninja-based Riders such as Kenzan from ''Saber'', Fuuma from the ''Ex-Aid'' movie, and ZX.
* ''Series/KamenRiderGotchard'' (2023-24)

** ''Film/KamenRiderTheFirst'': A ContinuityReboot movie of the original series, helmed by Creator/ToshikiInoue, son of the original show's headwritter Masaru Igami. The remake version of Takeshi Hongo cameos in episode 14 of ''Kamen Rider Kabuto'', and returns in ''Kamen Rider Zi-O: Final Stage'', linking the film to the main continuity and its multiverse much like ''Kikaider'' and its own reboot are as described below.

* ''Series/KamenRiderBlade'' (2004-05)

* ''Series/KamenRiderDrive'' (2014-15): ''Drive'' features, albeit in a minor capacity, a human terrorist organization known as Neo-Shade, who are said to date back to 2009, alluding to the bad guys from ''G''. Crossed over with ''Gaim'' in ''Movie War Full Throttle'', which also had a FreezeFrameBonus in the background depicting a landmark from ''Double''. Features an EarlyBirdCameo by Ghost in TheMovie as well as the final two episodes, the last of which is called back to early on in ''Ghost'' proper. Also crossed over with a ''Double'' character in the ''Drive Saga: Chaser'' V-Cinema. Crossed over with ''Shuriken Sentai Ninninger'' to promote ''Super Hero Taisen GP'' (though the special notably treats ''Drive'' and ''Ninninger'' as being in separate universes). Said movie's sequel miniseries crosses over with ''Den-O'' and acts as a FullyAbsorbedFinale to ''555''.

** ''Film/KamenRiderTheFirst'': A ContinuityReboot movie of the original series. The remake version of Takeshi Hongo cameos in episode 14 of ''Kamen Rider Kabuto'', and returns in ''Kamen Rider Zi-O: Final Stage'', linking the film to the main continuity and its multiverse much like ''Kikaider'' and its own reboot are as described below.

* ''Series/OhsamaSentaiKingOhger'' (2023-): The main mecha, King-Ohger, makes its debut in episode 45 of ''Donbrothers''. ''King-Ohger'' takes place in its own mirror version of Earth called Tikyū as the setting and the team being monarchs from the planet’s kingdoms. #31-32 is a two-part crossover with ''Kyoryuger'' which confirms that, unlike ''Kyuranger'', ''King-Ohger'' is still set within the prime ''Super Sentai'' universe, just on a different planet, the natives of Tiky&#363 being descended from Earthlings.

* ''Series/KamenRiderRyuki'' (2002-03): A DVD special has Ryuki meeting the unfamiliar Agito, but it was AllJustADream.

* ''Series/OhsamaSentaiKingOhger'' (2023-): The main mecha, King-Ohger, makes its debut in episode 45 of ''Donbrothers''. Like ''Kyuranger'', ''King-Ohger'' takes place in its own AlternateUniverse with an alternate version of Earth called Tikyū as the setting and the team being monarchs from the planet’s kingdoms. #31-32 is a two-part crossover with ''Kyoryuger''.

* ''Series/OhsamaSentaiKingOhger'' (2023-): The main mecha, King-Ohger, makes its debut in episode 45 of ''Donbrothers''. Like ''Kyuranger'', ''King-Ohger'' takes place in its own AlternateUniverse with an alternate version of Earth called Tikyū as the setting and the team being monarchs from the planet’s kingdoms.

* ''Series/TokusouRoboJanperson'' (1993-1994): Post-series, was incorporated into the ''Super Sentai''/''Metal Heroes'' shared universe by a ContinuityCameo in ''Super Hero Taisen Z''.

** ''Series/HikoninSentaiAkibaranger'' (2012-2013): Broadcast over two seasons, ''Akibaranger'' is an "unofficial" Sentai spin-off which takes place in a world where ''Super Sentai'' is but a fictional television franchise, but is distinct from the real world in that the ''Space Sheriff'' franchise is an anime franchise named ''Galactic Sheriff'' amongst other differences. The ''Akibaranger'' world itself is in its own little multiverse alongside the Delusion World where the Akibarangers fight their battles, the world of Saburo Hatte (the writer). Also, a LeaningOnTheFourthWall reference in ''[[Film/SpaceSheriffGavanVsTokusouSentaiDekaranger Gavan vs. Dekaranger]]'' could suggest that ''Akibaranger'' has influence on the prime ''Super Sentai'' universe itself, which is further implied in ''Superhero Senki'' via the Zenkaigers using an Akibaranger Sentai Gear.

* ''Series/NinjaCaptor'': [[AllThereInTheManual Supplementary materials]] confirm that it takes place in one of the worlds of the ''Series/KikaiSentaiZenkaiger'' multiverse.

* ''Series/KagakuSentaiDynaman'' (1983-1984)

* ''Series/ChoujinkiMetalder'' (1987-1988): Post-series, was finally incorporated into the ''Space Squad'' universe by a ContinuityCameo reference in ''Gavan vs. Dekaranger''.

* A special crossover miniseries called ''Series/KamenRiderOutsiders'' follows up on the {{Sequel Hook}}s from the ends of ''Kamen Rider Specter × Blades'' and the ''Kamen Rider Genms'' specials, with Riders and characters from ''Ryuki'', ''Decade'', ''Blade'', ''Drive'', and ''Revice'' returning as well. Continuing the narrative from the end of ''Smart Brain and the 1000% Crisis'', Foundation X attempts to resurrect and recruit various evil Riders throughout the franchise's multiverse to complete Project Outsiders, a LegionOfDoom assembled to counter the KnightTemplar AI Zein.

* ''Abarenbo Shogun'': The ''Kamen Rider OOO'' summer movie contains a CelebrityParadox indicating this period drama is simultaneously a ShowWithinAShow and set in the same universe via a time-traveling OOO teaming up with the show's version of Tokugawa Yoshimune.

* ''Series/KamenRiderZiO'' (2018-19): StealthSequel to ''Decade'', crossing over with all prior Heisei era seasons in various tribute episodes and movies, including ''Build'' in ''Heisei Generations FOREVER''[[note]], which also functions as a tribute episode dedicated to ''Double'', ''Den-O'', and particularly ''Kuuga''[[/note]], and is a RealWorldEpisode. TheMovie was a tribute episode for ''Drive'', as well as "Lost Heisei Riders" i.e. the three films from the 90's, and had a cameo from the protagonist of ''Kamen Norider''[[note]]WordOfGod claims these movies are CanonDiscontinuity and split into an AlternateTimeline's ending respectively, but their effect on the status quo and narrative is referenced just enough that BroadStrokes versions of their events must have occurred in the series[[/note]]. The finale suggests a [[spoiler:CosmicRetcon splitting the twenty Heisei era seasons into their own worlds as the natural state of being]], but continues to treat all Riders as sharing a universe in post-series crossovers.

* A special crossover miniseries called ''Series/KamenRiderOutsiders'' follows up on the {{Sequel Hook}}s from the ends of ''Kamen Rider Specter × Blades'' and the ''Kamen Rider Genms'' specials, with Riders and characters from ''Ryuki'', ''Decade'', ''Blade'', and ''Drive'' returning as well. Continuing the narrative from the end of ''Smart Brain and the 1000% Crisis'', Foundation X attempts to resurrect and recruit various evil Riders throughout the franchise's multiverse to complete Project Outsiders, a LegionOfDoom assembled to counter the KnightTemplar AI Zein.

** ''Film/KikaiderREBOOT'': Despite being an AlternateContinuity to the original, this film is also connected to the ''Kamen Rider'' universe as the eponymous hero guest stars in episode 30 of ''Series/KamenRiderGaim''. A TieInNovel story ''Kikaider Rebirth: Do Androids Dream of Electric Sheep'' acts as a sequel to the movie and the ''Gaim'' tie-in episode, and mentions a connection between the DARK Project from the former and Foundation X.

* ''Series/KamenRiderGeats'' (2022-23): Crossed over with ''Revice'' and ''Ryuki'' in ''Movie Battle Royale'', and with Ouja from ''Ryuki'' in the Hyper Battle DVD. The fight between Vice and Buffa on a train in the former has FreezeFrameBonus advertisements for companies and products from past seasons, including Touma’s novels from ''Saber'', Genm Corporation games from ''Ex-Aid'', Café nascita from ''Build'', ORE Journal from ''Ryuki'', and Hiden Intelligence and the amusement park from ''Zero-One''. One of the ''Geats Extra'' web-exclusive specials teams up Kamen Rider Tycoon with the characters of the ''RIDER TIME: Kamen Rider Shinobi'' miniseries from ''Zi-O'', featuring other ninja-based Riders such as Kenzan from ''Saber'', Fuuma from the ''Ex-Aid'' movie, and ZX.

* ''[[Film/BirthOfTheTenthGatherAllKamenRiders Birth of the Tenth! Gather All Kamen Riders!!]]'' was a TV special which doubled as a RecapEpisode of the whole franchise and introduced the tenth Rider, ZX, who fought with his nine predecessors against the Badan Empire, led by the same Great Leader. Officially, Toei considers the special to be the first, last, and only episode of its own ''Kamen Rider ZX'' TV series, and it is included in the count leading up to ''Kamen Rider OOO''’s celebration of the 999th and 1000th episodes of the franchise.

* ''Series/KamenRiderGaim'' (2013-14): Crossed over with ''Wizard'' in the ''Sengoku Movie Battle''. Began the tradition of ''Rider'' and ''Sentai'' having crossovers to promote the new ''Super Hero Taisen'' installment, by having a crossover with ''Ressha Sentai [=ToQger=]'' which features a surprise cameo by Narutaki from ''Decade''. The TieInNovel that picks up on the dangling plot threads from the ''Gaim Gaiden'' V-Cinemas incorporates elements from the ''Wizard'' crossover and the ''Kamen Rider Taisen'' movie, and features a cameo from Tsukasa Kadoya of ''Decade'' showing Mitsuzane the heroes of the other Heisei Rider seasons up to ''Drive''.
* ''Series/KamenRiderDrive'' (2014-15): ''Drive'' features, albeit in a minor capacity, a human terrorist organization known as Neo-Shade, who are said to date back to 2009, alluding to the bad guys from ''G''. Crossed over with ''Gaim'' in ''Movie War Full Throttle'', which also had a FreezeFrameBonus in the background depicting a landmark from ''Double''. Features an EarlyBirdCameo by Ghost in TheMovie as well as the final two episodes. Also crossed over with a ''Double'' character in the ''Drive Saga: Chaser'' V-Cinema. Crossed over with ''Shuriken Sentai Ninninger'' to promote ''Super Hero Taisen GP'' (though the special notably treats ''Drive'' and ''Ninninger'' as being in separate universes). Said movie's sequel miniseries crosses over with ''Den-O'' and acts as a FullyAbsorbedFinale to ''555''.

* ''Series/KamenRiderBuild'' (2017-18): Uniquely, ''Build'' sets itself in an AlternateUniverse to the prime ''Kamen Rider'' reality, as seen when it crosses over with ''Ex-Aid'', ''Ghost'', ''Gaim'', ''Fourze'', and ''OOO'' in ''Heisei Generations FINAL'' via dimensional travel to fight a MadScientist’s AllianceOfAlternates, one of whom is a Foundation X member. Features an EarlyBirdCameo by Zi-O in TheMovie. According to [[WordOfGod producer Takahito Ōmori]], the finale concluding with [[spoiler:the World of Build becoming a MergedReality with the main universe into a New World]] was intended to more easily facilitate future crossovers.

* ''Series/RobotDetective'': Crossed over with Toei heroes in a video game. An AlternateContinuity incarnation with AdaptationalVillainy appears in ''Film/ShinKamenRider2023''.