Rat Creature's Journal

Doubt, by ALEO. Gen, Don Eppes. (ca. 8,300 words)
Numb3rs/Supernatural
I recced the previous two stories in this series already (Unexplained and Explained), and this one is a good read too. The Supernatural world functions more as a vehicle for Don-whump than as equal crossover partner in this one, but it's not as if I dislike seeing Don hurt, and angst while he adjusts his worldview to the supernatural.

Unwilling Oracle, by Beatrice Otter. Gen, John Crichton, Kira Nerys. (ca. 1,870 words)
Farscape/Star Trek: Deep Space 9
This has a really cool premise meshing the wormhole mythologies.

Angels in the Architecture , by Davincis_girl. (ca. 12,000 words)
Supernatural/Terminator: The Sarah Connor Chronicles
I think the two universes are a great mix, especially when it comes to the various teenage experiences of growing up with pseudo-military training, and here John Connor travels back to 1999 and gets the teenaged Sam and Dean to help him.

Downloaded series, by Ennyousai. Slash and het, Kirk/McCoy, Scotty/Six. WIP (for the series, the stories are finished)
Battlestar Galactica (2003)/Star Trek: Reboot
I'm not familiar with BSG, but the author's notes said it would work if you just knew ST and it did work great as a Star Trek AU.

The Time Has Come to Be Gone, by Jujuberry136. Gen. (ca. 28,950 words)
Criminal Minds/Supernatural
I enjoy stories with the Criminal Minds team meeting and dealing with the Winchesters, and this one is a good action/case story.

The Mutant Problem, by Katt. Gen. (ca. 7,900 words)
Spider-Man/X-Men
This is a very cool multimedia fanfic in the form of a fictional photo essay by Peter Parker.

Pigs in Spaaaaaaaace, by Kayim. (ca. 2,580 words)
Muppets/Star Trek
How could I not love a crossover between Star Trek and Pigs in Space?

For I Have Been a Stranger in a Foreign Land, by Mortigi_tempo. Slash, Kirk/Spock. WIP (ca. 10,000 words so far)
Dune/Star Trek: Reboot
This is a very cool crossover setup. Kirk and Spock get stranded on Arrakis.

Northern Lights, by Se_parsons. Gen. (ca. 9,700 words)
Supernatural/The X-Files
In this one we get an outsider POV of the Winchester family as Mulder and Scully run into them during an investigation.

To Become Immortal, First You Have to Die, by ShadowLoverK. Gen. (ca. 3,200 words)
Highlander/Star Trek: Reboot
Kirk is an immortal and has his first death from an allergic reaction during the movie.

Abnormal Psychology (ca. 1,440 words) and A Sam Adams Moment (ca. 1,500 words), by Siriaeve. Gen, Sweets, John Sheppard.
Bones/Stargate: Atlantis
Sweets working for the SGC is just an awesome and funny premise.

A Thousand Pages, by Tartanshell. Gen, Scott Summers, Matt Murdock. (ca. 6,250 words)
Daredevil/X-Men
In this Matt and Scott were penpals fo a while as teenagers, then meet again as adults.

Seven Moments, by Barrowjane. Gen. (ca. 1,300 words)
Sandman/Star Trek: Reboot
There's just something about other characters meeting the Endless that I really enjoy, and this example of the genre is no exception.

Down The Rabbit Hole, by Bluflamingo. Slash, Colby/Lorne, Colby/Daniel. (ca. 10,000 words)
Numb3rs/Stargate: Atlantis/Stargate: SG-1
I like how this handles the relationships, the complications that come with dating outside of your secret alien conspiracy, and the way the SGC happens to tangle with the FBI here works for me too.

People Who Repair Quantums, or Five Planets The Enterprise Never Visited, by Ignipes. Gen. (ca. 2,800 words)
Star Trek: Reboot/Alien/Discworld/Doctor Who/Dune/Star Wars
I really enjoyed the crossovers for which I was familiar with the sources, also, while I don't know Discworld, the bit where Spock reacts to the flat disc and giant turtle and so on in space was awesome.

Bright White Light, by lilacsigil. Gen. (ca. 35,000 words)
Supernatural/X-Files
This is set during the X-Files episode "Fallen Angel", which I barely remembered, but the story still worked for me. We get the events of the episode but seen from the perspective (and worldview) of young Sam and Dean. I thought it was really cool how one side believes it's all aliens, and the other it's all supernatural and I was wondering what was really going on. And I liked Sam and Dean adventuring.

Exiles, by nwhepcat. Gen, Oz, Sam. WIP
The premise here is that Sam runs into Oz during Mystery Spot. I found this via Cofax and am really enjoying it so far. The parts are all quite short, but it is updated very often.

a fucking space opera (or Six Characters Who Didn't Board the USS Enterprise), by Oxoniensis. Gen. (3,169 words)
Star Trek: Reboot/Harry Potter/Merlin/Stargate Atlantis/Supernatural/Terminator: The Sarah Connor Chronicles
In the best tradition of wacky crossovers, this was simply a lot of fun.

Unexplained, by ALEO. Gen, Don Eppes. (ca. 4,260 words)
Numb3rs/Supernatural
During a serial killer investigation Don runs into the Winchesters. I enjoyed Don's outside POV of Sam and Dean here.

Temporary Alliances, by Cofax. Gen. (ca. 1,930 words)
Stargate: SG-1/Terminator: The Sarah Connor Chronicles
This is short, but has a great Jack POV, as SG-1 runs into a Terminator and Sarah Connor & co.

Connecting Dots & Straight Lines, by This Fish Flies. Slash, John Sheppard/Rodney McKay. (series, ca. 2,500 words so far)
Numb3rs/Stargate: Atlantis
This is mostly fluff with the premise that Sheppard is somehow related to the Eppes, but fun to read.

The Old World, by aesc. Slash, John Sheppard/Rodney McKay, Dean Winchester, Sam Winchester, Castiel. (ca. 10,890 words)
Stargate: Atlantis/Supernatural
They all run across each other on Earth while hunting wraith. This mixed the mythologies of the two shows in a cool way. (As a side note, even though the author labelled it McKay/Sheppard slash, it read gen to me.)

What Keeps The Light, by Eisoj5. Gen, Dan Vasser, Sarah Connor. (ca. 3,000 words)
Journeyman/Terminator: The Sarah Connor Chronicles
I'm a bit ambivalent about this one, because I would have liked to learn so much more of what happened. In a way it is more the start of what could have been an longer story. OTOH a timetravel crossover mixing Journeyman and Dan's involuntary timetravel with the Sarah Connor Chronicles is such a great fit, and I really like the setup here and the possibilities their meeting here opens.

Shotgun, by July. Gen. (ca. 18,000 words)
Friday Night Lights/Supernatural
This is also a bit of an AU, because of course in canon the Winchesters moved around a lot, but it feels more like a crossover than an AU. An the idea of Sam and Dean growing up in Dillon while John still hunts is simply awesome.

Twenty Four Hours, by Morgan32. Gen. (ca. 10,700 words)
Sentinel/Supernatural
This is set pre-series for SPN, and I really enjoyed seeing Sam and Dean as teenagers through Jim an Blair's eyes.

I just came across a great SGA/DS crossover while I was browsing my friends-of-friends list:

Birds of a Feather, by julia_here. Gen, Benton Fraser, Rodney McKay. (ca. 15,500 words) It's set mostly pre-series for both DS and SGA, but also has a section set after the SGA finale, so there are spoilers for that.

For some reason I haven't read many good crossovers recently so this isn't a set of recs like usual, but this one was fun:

Redefinition, by bluflamingo. Slash, Colby Granger/Evan Lorne, Cadman/Simpson. (ca. 6,790 words)
Numb3rs/SGA
This is more angsty than happy, but I liked this take on how hard it must be to have a cross-galaxy relationship.

Unrelated, it seems like much of my f-list is working towards or already in a turkey-induced coma, it's so quiet.

The fanlore wiki doesn't just cause me even more online activity dreams, it also makes me reminisce about past fandoms, and think fondly of fic I've read. Unfortunately too often I can't find the stories again, because sites and archives vanish. :(

I'd never thought one of my favorite X-Files/Homicide crossovers, Saundra's Mulder/Bayliss Slash-Evidence series, which I saw mentioned on fanlore, could be so hard to find again in its entirety, because X-Files is such a well archived fandom, and I remember it not just on her site but also on the Annex Novel archive and Gossamer, and on some slash archive or other, and its parts won a bunch of awards, yet when I looked for it today I found her site long gone and only some parts of the series in the archives that are still around, but not all stories. :(

However, since the parts are finished stories, and the first couple are still around I'm going to rec it anyway, because I reread the first parts and still like it, ten years after I first read the series. I found a WayBack Machine link to her site that lists the parts, but unfortunately the stories themselves aren't archived.

The main stories in the series were grouped in four arcs: Forward Slash, with the stories Young Blooded, Signature, Worst Case Scenario and Segue: Litany and Requiem is still available at Gossamer completely, also on other sites.

Trace Evidence, with the stories Inadmissable, Hobson's Choice, Say Goodnight and Coda: Penance and Lamentation, has unfortunately only the first part still available easily.

However I found Hobson's Choice in ten parts at the google archive of alt.tv.x-files.creative *hearts usenet* here: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

also Say Goodnight in ten parts too: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

and Coda: Penance and Lamentation in three parts: 1, 2, 3.

The third set of stories Cold Cases is archived at Gossamer: Filial Piety, Prescient Perception I, Prescient Perception II, and Epilogue.

The fourth set Sacrament of Silence started with: Segue: The Ties That Bind and Empty Cage was posted in 13 parts but only three of those made it into the usenet archive. (BTW, if anyone on my f-list has a complete copy or knows where to find it, I'd be really grateful.)

There were also a number of vignettes, some also available at Gossamer. Anyway, I dug it up as best as I could for you to read easily. It's a great series.

Pass the Pork-Barrel Salt, by Gwendolyn Grace and Etakyma. Gen, Sam Winchester, Dean Winchester, Josh Lyman, Donna Moss, C.J. Cregg. (ca. 5,000 words)
Supernatural/The West Wing
Josh meets the Winchesters during a "Big Block of Cheese Day". This crossover is simply a lot of fun.

Begotten and Gingerbread, by Nilchance. Gen, Alec, Sam Winchester, Dean Winchester, Boby Singer. WIP
Dark Angel/Supernatural
I'm not actually sure whether this is a series or a WIP, but I find it intriguing so far, because in this crossover the timelines of DA and SPN don't seem to have been messed with to mesh them, but instead Alec somehow ended up in 2008, though neither he nor the Winchesters seem to know the how or why yet.

Travelled on his looks, by Petronelle. Gen, Fraser, Ray K., Dick Grayson, Tim Drake. (ca. 2,200 words)
DC Universe/Due South
I'm not much interested in crossdressing, but Fraser and Ray teaming up with the Batclan here was fun.

Untitled, by Tassosss. Gen, Teyla Emmagan, Aeryn Sun. (ca. 2,840 words)
Farscape/Stargate: Atlantis
Teyla and Aeryn team up for a jailbreak, which is simply a great scenario.

Woman Inflammable, by Vehemently. Gen, John Winchester, Sarah Connor. (ca. 4,660 words)
Supernatural/Terminator: The Sarah Connor Chronicles
I really enjoyed this insight into John at the beginning of his hunting life, and the outsider look at Sarah. And of course John would have the worst luck in that that he picks Sarah Connor & Co to run into early on.

where the grass is green and the girls are pretty (ca. 2,165 words) and its sequel oh, won't you please take me home (ca. 2,700 words), by Vorrothiel. Gen, Ash, John Connor.
Supernatural/Terminator
There's something about crossovers between Supernatural and Terminator that really appeals to me. The universes just go together like hazelnuts and chocolate, IMO. Anyway, this one has the unique premise that Ash used to know John Connor in high school.

Nothing Like Billy, by Embroiderama. Het, Ellen Harvelle/Fox Mulder. (ca. 2,622 words)
Supernatural/The X-Files
There isn't much plot beyond the sex in this crossover, but there was enough characterization and a plausible reason for their meeting to not have the story feel arbitrary.

Leapin Lizards, by Gwendolyn Grace. Gen, Sam Winchester, Dean Winchester, Sam Beckett, Al Calavicci. (ca. 18,560 words)
Quantum Leap/Supernatural
Sam Beckett leaps into John Winchester when Dean and Sam were still children. There is a good case story, and Beckett has to deal with finding out that the supernatural is real, and handle two young Winchesters.

With a Bang, by Mink. Gen, Alec, Dean Winchester, Sam Winchester. (ca. 42,000 words)
Dark Angel/Supernatural
This is a good action-adventure, and I liked how the shows' mythologies were meshed, even though I'm not that into the whole breeding cult arc of DA season two. Also Alec, Sam and Dean together are just fun to watch.

Curiosities (ca. 4,045 words) and Stutter (ca. 1,500 words), by Penknife. Slash, Erik Lehnsherr/Charles Xavier, Tom Riddle, Lily Potter, Sirius Black.
Harry Potter/X-Men
Recently Penknife offered to write timestamp fic, and I noticed that I never recced the original crossover for which I requested a timestamp. Anyway, in the first Erik Lehnsherr encounters Tom Riddle in 1950, the timestamp is set during the first Voldemort war/the Marauders era, and both are interesting and well worth reading.

Brothers in Arms, by SylvanWitch. Gen, Dean Winchester, Derek Reese. (ca. 2,440 words)
Supernatural/Terminator: The Sarah Connor Chronicles
Dean runs into Derek while hunting, and somehow these two shows just go together like chocolate and hazelnuts.

What Kind of Day Has It Been?, by Victoria P. Gen, Dean Winchester, Sam Winchester, Kermit and the Muppet Show ensemble. (ca. 3,300 words)
Muppet Show/Supernatural
I love Muppet crossovers (felt rules! *g*), and this one made me laugh a lot.

Fandom: Stargate: Atlantis / Avatar: The Last Airbender Fusion
Characters/Pairings: Teyla as Waterbender
Media used: pencil, fine liner pen with waterproof indian ink, acrylic paint
Rating/warnings: G
Notes/comments: I did this for the prompt "SGA/Avatar the Last Airbender crossover" for the SGA fanart fest Painted Spires, as additional fanart for the Amnesty Week. This is more a fusion than a crossover, but I think it's still within the prompt's parameters. Originally this was supposed to be a series of portraits with each of the team matched with an element from Avatar (I thought after Teyla I'd do Rodney as Earthbender, Ronon as Firebender, and John as Airbender), but I only managed to finish Teyla in time to still post (just barely) during Amnesty Week.

Preview:

( the image and a high resolution detail are behind the cut )

AUs

Dearest, by Lavvyan. Slash, John Sheppard/Rodney McKay. (ca. 4,200 words)
The people with the ATA gene are regarded as pets in this AU, though then it turned somewhat atypical for slave/mindcontrol fic (and has a sad ending), but it still worked for my kinks.

After Such Knowledge, by Sarah T. Het, Michael/Teyla Emmagan. (ca. 7,500 words)
This is an AU of Michael's storyline, with the premise that Michael chose to remain human because Teyla was more honest with him.

Sequelae, by The Spike. Gen, John Sheppard, Rodney McKay, Jennifer Keller. (ca. 26,000 words)
It's a futurefic that goes AU during Adrift, though the past of how Atlantis was lost and the cause of the rift in John and Rodney's friendship is only gradually revealed, as John suddenly shows up at Rodney's doorstep, having a retrovirus relapse.

Pegasus Ascendant, by Tielan. Gen, Teyla Emmagan. (ca. 1,830 words)
Pegasus is without Wraith and various Pegasus people share control over Atlantis as the Earth expedition makes contact. I find the premise here very cool, though I wished there was more than this opening. I'm definitely hoping for a sequel.

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crossovers

Only Someone Running, by busaikko. Slash, Rodney McKay/Brendan Dean. (ca. 7,800 words)
Stargate: Atlantis/Thoughtcrimes
This crossover has awesome plot twists, and meshes the two universes well. It is rather sad though.

On the Use of Weapons, by Cofax. Gen, Ellen Harvelle. (ca. 1,600 words)
Supernatural/Terminator: The Sarah Connor Chronicles
In this snippet Ellen observes Sarah, John and Cameron at a gun show, and it gives a great outsider POV of the three.

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Also when I asked on the SGA genrefinder comm for stories with Sheppard as an Ancient or Sheppard ascending, I compiled a list of stories in that genre I had already come across, so I thought I might just as well repost that list on my website as reference. Here's a link collection with stories featuring John Sheppard as Ancient, Ori or Ascended. If you come across any I missed, let me know.

An Unlikely Meeting, by Cofax. Gen, Sam Winchester, Dean Winchester, Chiana, Rygel, John Crichton. (ca. 1,030 words)
Farscape/Supernatural
This just a snippet, more an opening into a universe than a full story, but what we get is such a cool crossover setup that it's worth pointing out regardless.

Nor Hell A Fury, by Lucy Gillam. Gen, Sam Winchester, Dean Winchester, Dennis Guilder, Christine. (ca. 14,800 words)
Stephen King's Christine/Supernatural
I haven't read Christine, but this was still a very enjoyable casefile type of story with neat twists in the the car's background. So if you like to read about the Winchesters hunting monsters or evil cars in this case, you should give this a try.

Untaken Roads, by Tassos. Gen, Dean Winchester, John Crichton. (ca. 4,500 words)
Farscape/Stargate: Atlantis/Supernatural
This gives us another glimpse at Crichton as Runner, like in the previous FS/SGA crossover by Tassos that I've also recced. And seeing him interact with Dean is just fun.

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Also, I forgot to c&p one of my SGA AU recs in the recs post yesterday, so I decided to tack it onto this one:

Choice of Duty, by Kyrdwyn. Gen, John Sheppard, Radek Zelenka. (ca. 4,680 words)
The premise here is that John is ex-military, and didn't join the Atlantis mission as military, but as a scientist. After Sumner's death, which happens later here than in canon, he's drafted back into active duty by Elizabeth. I'm not sure I see Elizabeth quite this way, but the interaction between John and Radek made this a nice read.

I updated my crossover recs page.

Take a Long Line, by Derry667. Gen, Dean Winchester, Sam Winchester, Don Eppes, Charlie Eppes, Alan Eppes. (ca. 22,000 words)
Numb3rs/Supernatural
The Winchesters are trying to stop a psychic arsonist at CalSci, which we see through the eyes of the Eppes. I liked how competent Sam and Dean were in this story as well as the the outsider look at them.

Defect, by Kikkimax. Gen, ensemble. (ca. 39,600 words)
Criminal Minds/Supernatural
This is set after the second season finale of Supernatural. While Sam tries to get Dean out of the deal with the demon with the help of Bobby and Ellen, Dean is taken into custody by the FBI and interrogated and evaluated by the BAU team. I really enjoyed the take of the profiler team on Dean, and how they try to make sense of him and revise their opinions without ever actually buying into Dean's supernatural worldview.

Untitled snippet, by Pentapus. Gen. (ca. 230 words)
Highlander/Stargate: Atlantis
This is just a brief snippet, but it is a very neat idea to merge the mythologies of the two shows.

Take Atlantis, by Siegeofangels. Gen. (ca. 800 words)
Muppet Show/Stargate: Atlantis
This is quite short, and doesn't really have a plot beyond "the Muppets visit Atlantis", OTOH having the Muppets on Atlantis is awesome and funny.

I updated my crossover recs page.

Old Country, by Astolat. Slash, Sam/Dean. (ca. 40,600 words)
Harry Potter/Supernatural
I don't read a lot of Wincest, but I think this crossover is a great read even if you prefer gen. It's a lot of fun, humor mixed into the angst and drama, and the merge of the Potterverse with SPN here works great, and I liked the take on goblins and their magic in particular.

Harvester of Eyes, by gwendolyngrace. Gen. (ca. 26,000 words)
Sandman/Supernatural
John Winchester hunts the Corinthian, meanwhile Sam and Dean get lost in the Dreaming. This crossover is a great blend of the two sources.

New Jersey Voodoo, by Rokeon. Gen. (ca. 1,020 words)
House/Stargate: Atlantis
This is short, but really funny. John has a relapse back towards Bug!John, starting with an at first innocuous rash and progressing from there, and House tries to diagnose.

Late Nite at the Sudzy Dudz, by Sarah Ellen. Gen. (ca. 3,500 words)
Supernatural/The X-Files
I have no idea how I could have missed reading this story for so long. This crossover is a lot of fun. I guess you could sum it up as "Mulder and Scully meet the Wincesters in a laundromat and talk about cattle mutilations." but the dialog is awesome and it made me laugh a lot, while still being plausible and in character within both series.

The Curious Incident of the Doc in the Night-time (part 2), by Taz. Gen. (ca. 2,920 words)
Highlander/House
House meets Methos in his morgue and is understandably curious. Snark ensues.

Winchesters at Hogwarts series, by Ignipes. Gen. (so far three stories with ca. 10,400 words)
Harry Potter/Supernatural
In this crossover AU John dies and Sam and Dean are sent to wizard relatives in England, so Dean attends Hogwarts.

And All the World Beneath, by Jenn. Slash, John Sheppard/Dean Winchester, John Sheppard/Rodney McKay. (ca. 67,000 words)
Stargate: Atlantis/Supernatural
This is a very cool and creepy apocafic, meshing Stargate and Supernatural in a way that makes sense for both mythologies.

Agents of Fortune, by Karasu Yurei. Gen, Dean Winchester, Sam Winchester, Alec, Lydecker, Renfro. WIP
Dark Angel/Supernatural
So far this seems to be a basic "let's make these characters meet" crossover, but it has a plot that makes sense and the way the universes are mixed is interesting. It's not exactly the canon universe for Dark Angel in that there was no Pulse, but it still feels more like a crossover than an AU premise. X5-494 is given the mission to kidnap Sam for the Manticore program, so he tries to impersonate Dean.

Bent, by Rachel Martin. Gen, Dean Winchester, Sam Winchester, Ororo Munroe, Scott Summers, Logan. (ca. 12,300 words so far) WIP
Supernatural/X-Men
This is set during the SPN episode Benders. Scott thinks that one of the Winchestes is an out-of-control mutant and goes to search for them to stop the deaths he thinks the Winchesters are responsible for.

I've accumulated enough of these to make a page worthwhile, so I've compiled all my previous crossover recs on a webpage, so that I can fix links and such in one place rather than assorted posts.

I had a rather neat Harry Potter/The Sarah Connor Chronicles dream. Unfortunately I didn't write it down right after waking up, so I've already forgotten the plot, but it was full of action-adventure stuff. I think, iirc, the main premise was somehow that the SkyNet and Terminator machines were initially built to take care of the wizard war problems and fallout by the muggles for their protection against magic, perhaps even through time travel, only of course that backfired somehow (don't ask me how the HP and Terminator timelines were made to match up, it just worked in my dream!), and now John Connor had to fight both the Terminators and evil wizards or something. I think he and his mom may have hooked up with Harry & Co. at some point, but I'm not sure anymore of the details. Still it was a pretty cool dream. And of course there'd be great potential for our teenage heroes who are expected to save the world to commiserate in this setup, but my dream wasn't heavy on the teenage savior angst.

AU recs

Stargate: Atlantis

Push and its sequel Pull, by jane_elliot. Slash Rodney McKay/John Sheppard. (ca. 39,000 words and 27,000 words)
It's somewhat like a Harlequin romance story. Rodney, who works at the SGC, has an accident with Sheppard, who lives on the streets as result from his severe PTSD and dishonorable discharge, which circumstances are slowly revealed through the story. Then friendship and romance follow with a fair but not overwhelming amount of angst.

Unidentified, by the_drifter. Slash Rodney McKay/John Sheppard. (ca. 30,000 words)
Everybody recced this already, but it a really good present-day (no Stargate) amnesia AU, in which Rodney looses his memory suddenly without explanation, and we see him (re-)discovering and to some extent redefining himself and his relationships to friends and family through Sheppard's POV.

Harry Potter

The If Sieve, by Cathy (crawfords_lover). Slash, Harry/Draco. (ca. 36,000 words)
Draco goes through potential alternative universes with a pensieve-like device, exploring what would have happened if he (or Harry) made different decisions. It's a cool magical device and the scenarios are HP fandom staples, but handled in an original way, often with not quite the expected outcome.

X-Men Movieverse

Forgotten, by cyndrarae. Slash, Scott/Logan. (ca. 2,450 words)
In this AU Scott survives X3 but has amnesia, and Logan eventually finds him. Also it is hookerfic, so you get two fannish tropes in one, which in this case is definitely a good thing, since they go great together with Scott angst.

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Crossover Recs

Untitled, by siriaeve. Gen, Aiden Ford, Ronon Dex, Rodney McKay, John Sheppard, and the Endless. (ca. 750 words)
Sandman/Stargate: SG-1/Stargate: Atlantis
It's a "Five Things" type story in which SGA and SG-1 characters meet the Endless, and while each vignette is short, they are also gorgeous.

AU recs

Stargate: Atlantis

Mnemonic, or Four Ways John Sheppard Didn't Lose His Mind, by cupidsbow. Slash, Rodney McKay/John Sheppard. (ca. 7,250 words)
I recently reread this story, and was surprised to find that I never recced it. It's four brief AUs all with cool worldbuilding, and all dealing with a different kind of amnesia or altered mind.

Junk Cheap, by devildoll. (ca. 13,000 words)
This AU is just sweet and fun, and John as a junk shop owner was kind of awesome.

Harvest Festival, by ras_fic. Slash, Rodney McKay/John Sheppard. (ca. 6,800 words)
This is a cool twist on the "AMTDI because of some backward fertility ritual" cliche, because in this AU the expedition members are Pegasus natives, and Rodney is a disgruntled priest, who's annoyed with the tradition of fertility rituals he doesn't believe in.

The One Where They're Antiglobalization Protestors, by sapote3. Slash, Rodney McKay/John Sheppard, team. (ca. 8,200 words)
Besides being biased in favor of this setting for meta reasons, I liked that the whole team was brought into this AU in a convincing way, and the vivid descriptions and worldbuilding.

Wide Open Ocean, by setissma. Slash, John Sheppard/Rodney McKay. (ca. 10,600 words)
John and Rodney work at an aquarium, and I don't actually remember many more specifics, except that it was a nice, entertaining romance story.

Thule-Gesellschaft, by valderys. Slash, John Sheppard/Rodney McKay. (ca. 7,600 words)
This look at how the alternate universe from the episode McKay & Mrs. Miller might be was creepy and kind of depressing, but full of cool wordbuilding too.

Supernatural

Physiologus, by imogenics. Gen, Sam, Dean. (ca. 5,630 words)
In this AU Sam was pre-med instead of pre-law and tries to find a scientific order in the supernatural phenomena they encounter.

The Sunless Land by lyra_wing. Slash, Sam/Dean, Meg, John. (ca. 11,700 words)
It's kind of rare for me to read Wincest fic, but that they didn't grow up together in this AU made it much easier for me to buy that they'd be attracted to each other, and I have a soft spot for stories in which Sam is kidnapped by the YED and grows up with him and Meg, especially when they are not OTT dark fic, but the demon is still creepy, like in this one.

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crossover recs

Chicago, by ficwriter1966. Gen, Carol Hathaway, Dean, Sam, John. (ca. 4,900 words)
ER/Supernatural
I like outsider viewpoints, so looking at the pre-series Winchesters from Carol Hathaway's POV was really neat.

Knight's Gambit, by killabeez. Slash, Methos/Alva Keel, Duncan/Methos implied. (ca. 4,000 words)
Highlander/Miracles
I admit that I was a little bit lost with the demon plot in this story, because I know very little about Highlander (I've only watched a handful of the first season ages ago and a couple of xovers), but I couldn't resist the allure of Miracles fic. Even missing some of the Highlander context, this was still a very cool x-over premise, not least because Alva as an immortal would not just fit with him knowing all those languages, but explain why that investigation firm of his apparently doesn't really needs to earn money, yet he can still pay his employees.