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Anime and Manga
- In Digimon, after the events of Anode Tamer and Cathode Tamer for the Wonderswan - sorry, No Export for You - Ryo Akiyama dimension-hops to the Adventure universe. He witnesses the battle with Diablomon from the second movie and meets with Ken Ichijouji. Ryo and Ken defeated Milleniummon in Tag Tamers and Ken is infected with a Dark Spore, setting events in motion for Adventure 02 and confusing the hell out of anyone who had to take Ken's flashbacks to those events at face value with no knowledge of the games. Later in Brave Tamer, his partner Monodramon merges with Milleniummon resulting in Cyberdramon. Ryo then appears in Tamers, a universe separate from Adventure, and he has Cyberdramon with him who is aggressive and uncontrollable due to Milleniummon's half of his being. So this is basically three (or more) very separate continuities all connected through Ryo.
- It should be noted that Ryo's movie and 02 scenes go unnoticed by American viewers because he resembles Wonderswan Ryo far more than Tamers Ryo because of the art style (even once Tamers Ryo leaves the Digital World and gets the shirt he has in Anode/Cathode.) Once you know what he looks like, there's no mistaking his movie and 02 flashback appearances for anyone else.
- All of Ken Akamatsu's manga series seem to have this, especially Love Hina and Mahou Sensei Negima!. Specifically, both series have identical characters named Mei, who appear to be the same person, Word of God states that the inn that Keitaro and Naru stayed at in Love Hina was the same inn that several characters from Negima stayed at, and the Shinmeiryu sword school is used by characters in both series. In one Negima chapter, Motoko's family name was explicitly mentioned in relation to Shinmeiryu techniques, and a specific technique ("Zanmaken: Ni No Tachi") used in Love Hina has minor plot relevance in Negima.
- Negima also has a shout out to his first manga, A.I. Love You, when the subject of sentient A.I. comes up; it's hinted that part of Chachamaru's programming may have been written by A.I. Love You's protagonist.
- Akamatsu himself has confirmed that the Nitta-sensei from A.I. Love You and the Nitta-sensei from Negima are the same person, as well as the fact that Love Hina's Motoko Aoyama and Negima's Eishun are related somehow.
- Xxx Ho Li C and Tsubasa -RESERVoir CHRoNiCLE- both merge at numerous times, and characters in one series are often seen in another. The anime for both series, due to unfortunate copyright issues, don't cross over as much.
- Clearly the Marvel Universe, which includes characters from the Fantastic Four, The Incredible Hulk, Spider-Man, Iron Man, Captain America, Ghost Rider, The X-Men, The Punisher and many more.
- DC Comics has done this as well, like with Batman and Superman.
- At one time this was the exception rather than the rule... each story was set in its own continuity and it was rare for one costumed hero to even be aware that others existed. It wasn't until the Justice Society of America title in 1940 that heroes interacted with each other on a regular basis, and it proved so popular that DC eventually attempted to weave pretty much all its titles into a single overarching continuity (things that couldn't be made to conform were assigned to alternate universes in the "multiverse" concept, and it was possible to cross even those over if a writer really wanted to... the first such crossover involved Barry Allen and Jay Garrick (both "The Flash" in different universes).
- It's not uncommon for a main character in one Sin City story to play a minor role or even a cameo in a different story. Many stories have also been shown to happen at the same time, such as Hard Goodbye and A Dame To Kill For.
- The Marvel Cinematic Universe is one of the very rare movie examples; while all movies are self-contained, there are lots and lots of references to the other ones.
- Nick Fury has appeared in Iron Man, Iron Man 2, Thor and Captain America: The First Avenger, while Tony Stark made an appearance at the end of The Incredible Hulk. In The Avengers, the main characters from all the mentioned movies will join forces. Sadly, we're Screwed by the Lawyers when it comes to anyone from the Fantastic Four or X-Men films appearing, despite The Thing, Mister Fantastic, and Wolverine having been in Avengers comics for some time now and Beast having a long history with them.
- And now, of course, we have The Avengers tying it together, along with the TV Series Agents of S.H.I.E.L.D., which tends to reference every movie that has occurred in the MCU, including movies that only came out a week before the episode containing the reference aired.
- Captain America: The Winter Soldier had a huge impact on Agents of S.H.I.E.L.D., far moreso than any other movie in the verse, given that the big reveal of Winter Soldier concerns HYDRA's infiltration of S.H.I.E.L.D.
- The View Askewniverse, The Verse in which Kevin Smith has set 6 films, several comic books, and an Animated Adaptation.
- Several characters will be heard about in one movie, only to be seen in a later film.
- Behind-the-scenes pictures of some of the maintenance panels on the X-Jet in X2 reveal that some systems were built by Stark Enterprises (and that there were no user serviceable parts inside!), but they're far too small to be seen onscreen. An "Intercontinuity Nod"?
- In the Honorverse the novels Ashes of Victory/Mission of Honor, Crown of Slaves/Torch of Freedom and Shadow of Saganami/Storm from the Shadows all take place concurrently, so we get three different looks at the same sequence of events, and often have entire chapters duplicated across books.
- In the Dragonriders of Pern novels, the events of Dragonquest, the second Lessa novel, affect the events of Dragonsinger, the second Menolly novel. Also many other cases, since all the Pern novels are explicitly set in the same universe and it's very common for the main characters in one novel to be minor characters in another and for there to be considerable chronological overlap (Dragonquest and Dragonsinger cover roughly the same time period as experienced by two different people). This is complicated even more by the (somewhat risky) draconic ability to time travel.
- All of Brandon Sanderson's adult novels (Elantris, Mistborn, Warbreaker and The Stormlight Archive so far, with others forthcoming) are set in the same universe, with at least one character (Hoid) appearing or being referenced in every one, and hints of a broader Myth Arc on the horizon.
- Almost all of David Walliams' children's novels take place in the same universe, and in fact in the same town, but the only crossover character is Raj the newsagent. The only exception so far takes place about a hundred years ago.
Live Action TV
- Star Trek did this as well when Deep Space Nine, Voyager, and The Next Generation films were all running at the same time.
- Miles O'Brien passed over to Deep Space Nine in its pilot episode. After the destruction of the Enterprise in the Generations movie, Worf joined the station as well. The Deep Space Nine crew changed uniforms after First Contact.
- This also meant that Worf's presence in the movies following Generations had to be continuously Hand Waved, as he was not assigned to the Enterprise-E.
- There is an entire episode of Voyager where the destruction of the Maquis by the Dominion/Cardassian alliance over in Deep Space Nine was a key part of the plot.
- Buffy the Vampire Slayer and Angel interacted so much during their respective fourth and first seasons that watching them in concert is almost a necessity to understand what's going on in either. This would continue to a lesser degree in later seasons; in particular season four of Angel had several hints about the events of Buffy's seventh (and final) season.
- There is Continuity Overlap between the last seasons of Stargate SG-1 and the start of Stargate Atlantis, as well as between the end of the fourth season of Stargate Atlantis and the Stargate Continuum movie.
- The new series of Doctor Who, The Sarah Jane Adventures and Torchwood have the occasional continuation between them. For example, the Sontaran invasion in Doctor Who leads to a stranded Sontaran soldier in The Sarah Jane Adventures.
- Bryan Fuller's works — Dead Like Me, Pushing Daisies and Wonderfalls — are all apparently set in the same universe. Pushing Daisies and Wonderfalls share a character (a one-timer) and Pushing Daisies also refers to Happy Time Temp Agency, which is where George worked in Dead Like Me.
- Friends, Mad About You and Caroline in the City are all in the same universe, although they don't have a major impact on one another, just cameos by characters in each work.
- CSI hosted the Poorly Disguised Pilot of CSI: Miami, which in turn CSI: New York launched from, so the teams exist in the same universe, and even a killer that was featured first in Miami was caught in the NY show.
- Similarly, JAG spawned NCIS which spawned NCIS: Los Angeles. Other than the Poorly Disguised Pilot, there was one minor cross-over of a JAG lawyer appearing on NCIS. Abby Sciuto is the only character on either of the three to appear on all three shows.
- The entire Law & Order universe, with guest appearances by many actors on other shows.
- The Syfy Channel's played this game, with crossovers between Eureka, Warehouse 13, and Alphas.
- This requires some mental gymnastics for the latter two, as they have vaguely similar premises of 'find weird things happening, investigate weird things, deal with weird things', only one had the weird things caused by objects and the other by people. Fridge Logic kicks in when you realize that the cause of the weirdness is not always (or even usually) immediately apparent, so by all rights the two casts should run into each other on a semi-weekly basis.
- When Bobby Ewing was killed off on Dallas, it was mentioned in Spin-Off Knots Landing, and Gary Ewing named his newborn son after his late brother. After the infamous All Just a Dream Reset Button that brought Bobby back, Knots Landing stopped referencing its parent show.
- The shared universe of Arrow and The Flash brings up a few of these. Crossovers between the shows are paired (Arrow characters show up on Flash the same week that Flash characters show up on Arrow), and as such the first crossover tends to lead into the second. There is also a notable case with Deathbolt, a Villain of the Week on Arrow who was locked up in Star Labs: a later episode of Flash made heavy use of him, with no explanation of where he came from.
- For most of his Ring of Honor career, Chris Sabin did very little in the company itself and was most significant for his feuds with AJ Styles in NWA-TNA. Similarly, his conspiracy with Alex Shelley against the Knights Of The Rising Dawn and boasts that they innovated the junior heavyweight style make little sense in the context of ROH itself, as it doesn't even have weight classes but makes perfect sense in the context of their New Japan run. Despite Sabin's betrayal of them in ROH, Christopher Daniels and Frankie Kazarian hated The Young Bucks more over an event two years ago in Pro Wrestling Guerilla. In turn, most of Erik Stevens's run in Full Impact Pro would be uneventful if not for his FIP title defenses in ROH and War Machine received a shot at the GHC Heavyweight Tag Team Champions Killer Elite Squad based on their ROH exploits rather than anything they ever did in NOAH.
- Vanessa Kraven had never interacted with Jessicka Havok in SHINE prior to show 28 but called her out in the lead up over a year's past encounter in SHIMMER. Cherry Bomb was the first wrestler in SHIMMER to lose to Candice LeRae but volume 80 revealed Bomb was more upset about the collar bone LeRae had broken at a WSU event.
- All of Volition's games take place in the same continuity, where the Saints Row series serves as a prequel to the Red Faction series, taking place 20 Minutes into the Future. Volition no longer have the rights to the FreeSpace series, but a "Subach Industries" shows up in Saints Row, referencing the Subach-Innes corporation from the former.
- Valve's Half-Life and Portal videogame series canonically exist in the same universe.
- Portal was introduced in the "Orange Box" compilation as a Gaiden Game borrowing elements of the Half-Life universe — specifically, it mentions Black Mesa as a competitor to Aperture Science for government funding, and Word of God says that GLaDOS awakening and subsequently going berserk coincided with the Combine invasion of Earth, preventing the scientists from getting help.
- Half-Life 2: Episode 2, for its part, introduces a ship called the Borealis as a major plot element; said ship was built by Aperture as part of an early teleportation experiment and "vanished, along with part of the dry-dock".
- Portal 2 continues the gag with an Easter Egg where you actually find the other part of the dry-dock, complete with a life preserver labeled "Borealis", and Cave Johnson directly mentions Black Mesa in the pre-recorded messages you find in Old Aperture.
- Street Fighter, Final Fight, and Rival Schools are all in the same universe. Several characters from Final Fight have become a regular part of Street Fighter, most notably Cody, Guy, and Rolento, and Sakura was playable in the first Rival Schools. Since Saturday Night Slam Masters is in the Final Fight timeline (Haggar is in the cast, and canonically it's what he did before he became mayor), that puts it in the same setting as well.