RatCreature'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.

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.

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.

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.