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Doppleganger Crossover
Seems a bit like talking to yourself.

"So," Chekov clapped his hands in eagerness, "who's the problem?" When Riker pointed down at the deck, he blinked and said, "Oh, there he is." He knelt down and rolled the still-senseless Bester over, checking him for weapons. "Rather a handsome devil, isn't he?"
"We hadn't noticed," Worf growled.
Pavel Chekov taking Alfred Bester into custody, during the Undocumented Features story "A Day of Infamy".

Let's say you're a fanfic writer.

Let's make another assumption and say that you like a particular actor and everything they've ever been in, because they were in it.

It's entirely possible that you may write a Doppleganger Crossover, a story in which two characters played by the same actor meet each other. (Or that they are each other.)

In other words, a crossover which is only happening because the two sources share an actor.

You may desperately want Riker to meet Xanatos, or Ranma to be a reincarnation of Inuyasha, or you might just want to see what happens when John Crichton takes the place of Cameron Mitchell, and don't even start on what would happen if Han Solo bumped into Henry Jones Jr.. The end result, however is the same. A Doppleganger Crossover.

On occasion, this can be one part of a Massive Multiplayer Crossover. Compare I Want You To Meet An Old Friend Of Mine.

Examples:

  • The obligatory Ranma 1/2 example involves a crossover with Ah My Goddess — in which it is inevitable that Belldandy and Kasumi (both sweet, innocent, domestic characters voiced by Kikuko Inoue) sit down to trade recipes, or better yet, collaborate on a meal.
    • Subverted in Chris Davies' Mega Crossover Together Again 1996 Chapter, where it's revealed that Kasumi is a reincarnated inhabitant of the Silver Millennium with some very strong, very negative opinions about "the monsters who call themselves gods" (to use her words from the story), and who is outright hostile to Belldandy.
      • However, they seem to be getting along much better in another story in that series, Together Again 2937 Chapter.
    • The Boss from Metal Gear was also voiced by the same person. This troper shudders in horrified morbid anticipation.
      • Nah, I bet nearly all of them only care for the English Metal Gear voice cast. Which in turn means that they can stick the Boss with Pearl Krabs... and that'd be even worse.
    • There was also at least one Ranma fanfic crossing over with Magic Knight Rayearth, on the basis that Hikaru Shidou looks like Girl-type Ranma.
    • Plenty of fanfic also involving Lina Inverse meeting up with female Ranma. Or the latter and Rei Ayanami. There was even one with Ai Amano. Blame Megumi Hayashibara and her amazingly prolific career.
    • And don't forget the some-odd Ranma/Inuyasha crossovers where Ranma invariably turns out to be Inuyasha's reincarnation. They're up in the article itself for a reason.
  • Harrison Ford has such a career with fingers in the pies of so many fandoms that he is almost a too-obvious go-to person for this fanfic trope. What happens when Jack Ryan tries to rescue the president aboard Air Force One? What if Lieutenant Deckard is chasing The Fugitive? What if Indiana Jones found the wreckage of the Millenium Falcon in the Northwest United States while looking for Bigfoot? (That one is an official, non-canon comic story, mind you.) And most importantly, who would win in a fight?
  • This Troper has seen umptynine Life On Mars fics that reveal that Sam Tyler is... in fact, the Master.
    • This troper isn't sure whether or not that's more ridiculous than the idea of Ianto being the Master's son...
  • A target of frequent fic speculation, though little actual writing in this troper's experience, is voice actress Kotono Mitsuishi, whose incredibly broad portfolio of roles offers a vast range of possibilities: imagine, if you will, an intersection of any two or more of Misato Katsuragi, Mink, Usagi Tsukino, Excel Excel, Christie, Murrue Ramius, Cathy Taymor, Gracia Hughes, Kagura Soma, Mireille Bouquet, Juri Arisugawa, Ebichu and Birdy Cephon Altirra, just to name a few.
  • The Official Fanfiction University of Middle-Earth contained a chapter where the "teachers" (read: cast of Lord Of The Rings) were all replaced by other characters played by the same actors.
  • Stargate SG-1. MacGyver. There are too many of these fics, far too many JackGuyvers.
  • Buffy The Vampire Slayer/Firefly crossovers have at least two special variations unique to them, one where Xander initially panics upon meeting Mal Reynolds because of the latter's resemblance to Caleb, and one where cast members from Angel mistake Zoe for Jasmine.
    • There is at least one fic out there which hits both of these, and ends with Wash plaintively asking when they'll find the world where he's worshipped as a god.
  • This troper has recently watched Robin Hood: Prince of Thieves after having not seen it in years and was struck to realize that the Sheriff of Nottingham bore a striking resemblance to Severus Snape. Mostly the similarity in the characters is in the accent, but it was very interesting to note one of the first scenes in the movie, where Sheriff NottingSnape and his allies are dressed in white robes and masks reminiscent of Death Eaters.
  • Philip Akin appeared as a regular in the first season of War of the Worlds, Adrian Paul in the second. Since both actors also appeared in Highlander The Series, crossovers make up a sizable proportion of War of the Worlds fanfic, either with Kincaid as a cover identity for Macleod or one being mistaken for the other.
  • Andromeda all but canonized the notion that Dylan Hunt is the reincarnation of Hercules. This Troper first encountered the crossover in, of all things, a Knight Rider fanfic.
  • Although there are no known examples yet, somewhere there is a Swans Crossing/Buffy The Vampire Slayer fic just itching to be written.
  • This troper saw a fanfic wherein Jayne Cobb was John Casey, (albeit via Buffy, Highlander, and Supernatural).
  • This.
  • Masi Oka portrayed lab-guy Franklin on Scrubs and now portrays Hiro Nakamura on Heroes, a fact picked up on in one or two fanworks.
  • Buffy The Vampire Slayer and Veronica Mars share enough actors to make an arsenal of this, albeit most of them in minor roles in the latter. And that's without getting to the fact that Veronica dated Iceman and Mac dated The Flash. It's superhero central, guys.
  • This troper (Daibhid C)'s own "Life of Doctor" is a drabble in which Judy from The Second Coming mistakes the Ninth Doctor for Steve Baxter. Being a drabble, that's the entire plot.
    • He is also one of two authors who are determinedly crossing over everything Stephen Fry has ever appeared in, via the Minister of Chance from the Doctor Who webdrama "Death Comes To Time" either meeting his counterparts or taking on their characteristics.
  • Claude from Heroes being secretly the Ninth Doctor is a particularly common one.
  • Haruhi Suzumiya meeting Konata Izumi. That is all.
  • Done in reverse, with the official X-Men/Star Trek The Next Generation crossover which featured Captain Picard meeting Professor Xavier, but came out before the first X-Men movie.
  • One can only speculate at just what the hell happened to Badger once the crew left him to make him straighten up, learn the law and start ste— no, wait, that one's already covered. Still, going from kinda-Cockney crime boss to President of the Colonies, pretty impressive feat.
  • The Harry Potter and Twilight series both feature actor Robert Pattinson in their respective film adaptations, although it would take some rather violent Hand Waving to make Cedric Diggory and Edward Cullen the same person. This has mostly been fodder for the MuggleNet Caption Contest.
  • The first "Echo is Faith" fics started showing up less than 24 hours after Dollhouse was announced — i.e., more than a year before the first episode aired. Amy Acker getting cast didn't help.
  • Aside from the above example of Xanatos and Riker, Gargoyles and Star Trek The Next Generation shared Marina Sirtis, Michael Dorn, Brent Spiner, Le Var Burton, and Colm Meaney. Cameos from other Star Trek series included Kate Mulgrew as fairy queen Titania and Nichelle Nichols as the female lead's mother. Crossovers milked this for all it was worth.
  • There seem to be quite a few Supernatural and Dark Angel crossover fics, though their ubiquity isn't completely surprising since Dark Angel had a secret cloning program as part of its premise. In light of that, it was probably inevitable.