* ScienceFiction author Creator/PhilipJoseFarmer:
** The ''[[http://en.wikipedia.org/wiki/Wold_Newton_family Wold-Newton]]'' [[TheVerse universe]] includes scores of [[PublicDomainCharacter public domain characters]] as well as many characters popular from early RadioDrama and film, such as Radio/TheShadow and Tarzan, who are not quite out of copyright. [[{{Fanfic}} Fans]] have added many modern TV characters to the list.
** The ''Literature/{{Riverworld}}'' series does this with actual people from history.
* Creator/KimNewman does this a ''lot'', most notably ''Literature/AnnoDracula'', which features [[http://www.pjfarmer.com/woldnewton/AnnoDracula.htm just about everyone]].
** His novella ''Literature/TeddyBearsPicnic'' is about Terry and Bob of the British sitcom ''Series/TheLikelyLads'' fighting in the Vietnam war with William of Richmal Crompton's old ''Literature/JustWilliam'' stories and other fictional characters.
** The student rosters appearing at the end of his ''Drearcliff Manor'' subseries indicate that his weird boarding school attracts everyone from [[Series/DoctorWho young Time Ladies]] to future members of Franchise/TheAddamsFamily.
** ''Literature/AngelsOfMusic'' transfers the premise of ''Series/CharliesAngels'' to the 19th century, with Literature/{{the Phantom of the Opera}} as Charlie and a rotating cast of heroines from the sensational fiction of the period as Angels, and various other period characters as clients, friends, or adversaries.
* ''Silverlock'' by John Myers Myers, in which the protagonist A. Clarence Shandon is shipwrecked in the Commonwealth of Letters, where everywhere he goes and everyone he meets is a literary, mythical and/or historical reference. A fairly extensive list of specific references can be found [[http://www.anitra.net/commonwealth/refindex.html here]].
* Creator/RobertAHeinlein's ''Literature/TheNumberOfTheBeast'' features a TimeTravel device that does double duty as a portal into TheMultiverse, allowing his characters to visit every fictional universe ever, including all of Heinlein's own novels. They coin the term "World as Myth" to describe the RecursiveCanon necessary to make this work, and wind up hosting a convention for just about every ScienceFiction character ever.
* Spider Robinson's ''Literature/CallahansCrosstimeSaloon'' series - including ''Callahan's Lady'' - contains cameos from characters created by crime writer Donald E. Westlake, SF legend Robert Heinlein, and even classic British humorist Creator/PGWodehouse, all interacting with each other. (Most likely inspired by Heinlein's ''Literature/TheNumberOfTheBeast'', mentioned above.)
* Creator/SimonRGreen's ''Literature/{{Nightside}}'' take place in a secret city under London that's a giant crossoverfest. John Taylor, Green's protagonist, has met characters from all manner of books, movies, television shows, and other assorted places though they are largely referred to in vague, shadowy terms so he doesn't violate the copyrights too badly. There's everything from a [[Series/DoctorWho Traveling Doctor]] who had a trick with celery to having to exorcise [[Franchise/EvilDead Kandarian demons]] from his answering machine to giant '[[Literature/WinnieThePooh bears of little brain]]' that work for the auction house. For even more fun, representatives from most of Green's other series (the ''Literature/{{Deathstalker}}'' novels, the ''Darkwood'' books, etc) show up, waiting around to speak to Father Time.
* While Creator/NeilGaiman's short story ''A Study in Emerald'' is primarily a crossover between the works of Creator/HPLovecraft and Arthur Conan Doyle, it contains subtle hints that characters such as Literature/{{Dracula}}, Literature/{{Frankenstein}}, and Dr. Jekyll also exist in the same universe.
* Creator/RogerZelazny took a few stabs at this trope:
** ''Literature/ANightInTheLonesomeOctober'' features UsefulNotes/JackTheRipper, Franchise/SherlockHolmes, {{Dracula}}, Literature/{{Frankenstein}}, UsefulNotes/RasputinTheMadMonk, Film/TheWolfMan1941, and many others in a complex game determining whether or not [[Franchise/CthulhuMythos Cthulhu]] and the other elder gods return to Earth. Interestingly, Jack is the hero...
** Zelazny was a comic book reader and fan. In ''[[Literature/TheChroniclesOfAmber Blood of Amber]]'' Merlin has dinner at Bloody (Last Deceased Owner's Name)'s place--Bloody Andy's at the time--while a gent (with a pronounced scar through his eye) eats at a neighboring table and warns Merlin to show a blade so the local roughs get no ideas. "Old John" was clearly John Ostrander and Tim Truman's mercenary John Gaunt (aka Grinner, ComicBook/GrimJack) from Cynosure, a cross-dimensional city in a multiverse adjacent to Amber. The two roughs did not last the night.
** A later Amber short story by Zelazny features Corwin visiting Wildwood Cemetary, where he sees the graves of John Gaunt, [[ComicBook/TheSpirit Denny Colt]] and [[Literature/TheDestroyer Remo Williams]].
* Creator/StephenKing's ''Franchise/TheDarkTower'' series spans across the majority of his prior works.
* The ''Literature/HaroldShea'' series of short stories are about Harold and company visiting various [[TheVerse settings]] taken from mythology and [[PublicDomainCharacter public domain fiction]], usually one per story.
* Brazilian author [[http://en.wikipedia.org/wiki/Monteiro_Lobato Monteiro Lobato]] took this trope to insane levels in his kid's books set in the ''[[Literature/SitioDoPicapauAmarelo Yellow Woodpecker Farm]]''. The eponymous farm is an interdimensional nexus to, essentially, every fantasy and adventure fiction character ever written, including but not limited to the Greek Gods, Franchise/SherlockHolmes, the Neverland people, the ''Literature/ArabianNights'', the fables from Creator/{{Aesop}}, [[Creator/TheBrothersGrimm Grimm]], [[Creator/HansChristianAndersen Andersen]], Literature/TheThreeMusketeers, medieval Knights, etc etc etc ad infinitum. He even managed to throw in some characters copyright laws didn't allow him to. To top if off, characters native to the series' own universe are not few in number.
* Creator/JasperFforde's like this trope a lot. Pretty much every Bookworld character in the Literature/ThursdayNext series comes from another book. According to the rules of its [[TheVerse universe]] ''every'' book crosses over with it. [[MetaFiction Including itself]]. Many of the characters from the Nursery Crimes series [[ExactlyWhatItSaysOnTheTin are right out of]] {{nursery rhyme}}s.
* Creator/LFrankBaum did this in the fifth book of the Oz series, ''Literature/TheRoadToOz'', by inviting characters from his other books to attend Princess Ozma's birthday party, hoping to get his Oz readers interested in those other non-Oz stories. This included everybody up to and including SantaClaus (as in ''The Life and Adventures of''). The implication, of course, is that every book Baum ever wrote takes place in the same universe as the Oz books.
* James A. Owen's ''Literature/TheChroniclesOfTheImaginariumGeographica'' does this with pretty much every major work of fantasy, history, and real life. From King Arthur to C.S. Lewis to Greek Myths all in 1 epic tale spanning time travel, history and all western literature.
* In Creator/AletheaKontis's ''Literature/{{Enchanted}}'', multiple fairy tales are true, from the red shoes that dance Tuesday to death, to Monday being the princess in the Princess and the Pea, to Sunday's meeting up with the Frog Prince, and the whole family living in what was once Rapunzel's tower.
* In Creator/EDBaker's ''Literature/TheWideAwakePrincess'', Literature/SleepingBeauty's younger sister is wary because of the tale of Literature/LittleRedRidingHood, meets up with Literature/HanselAndGretel at the witch's, etc.
* ''The Breath of God'', a Literature/SherlockHolmes pastiche by Guy Adams, has Holmes needing supernatural assistance, and teaming up with Creator/AleisterCrowley, Literature/CarnackiTheGhostFinder, [[Creator/AlgernonBlackwood John Silence]] and [[Creator/MRJames Julian Karswell]].
* Creator/LJagiLamplighter's ''Literature/RachelGriffin'' is based on a role-playing game of this. For rights reasons, it's all Expys now, but the originals are frequently detectable. Such as the original of Vladimir von Dread.
* Creator/DavidWeber [[http://www.davidweber.net/posts/427-safehold-silliness.html wrote a joke ending]] for ''Literature/{{Safehold}}'' that makes it a crossover with ''Literature/EmpireFromTheAshes'', ''Literature/TheWarGods'', ''Literature/{{Bolo}}'', ''Literature/InFuryBorn'' and ''Franchise/BattlestarGalactica'' (all of which it has at least some thematic parallels with).
* ''Ask a Policeman'' is a RoundRobin by members of the Detection Club (specifically John Rhode, Helen Simpson, Gladys Mitchell, Anthony Berkeley, Creator/DorothyLSayers, and Milward Kennedy) in which Literature/LordPeterWimsey, [[Series/TheMrsBradleyMysteries Mrs Bradley]], Roger Sheringham, and Sir John Samaurez investigate the same murder, with the further twist that the authors have swapped detectives.
* ''Literature/{{Superfolks}}'' has the ''Creator/DCComics'' superheroes and villains though most of the heroes have since died. There's mention of ''Film/InvasionOfTheBodysnatchers'' being a [[ATrueStoryInMyUniverse documentary]] and ''Literature/PeterPan'' and ''Series/{{Kojak}}'' make cameos, among others.
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