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Days Like This by killa
[Angel/Supernatural]
Dean and Angel in a tunnel, fighting a demon. It goes about as well as you'd think. A thoughtful, well-executed crossover.

The Father Goose Tales by litmouse
[Buffy the Vampire Slayer/Various]
I should not, in good conscience, recommend this series. I want too badly to beat the author about the head with periods and semi-colons until he learns to use them properly -- or, at all. However, once I got past that (and it took surprisingly little time), this series entertained the hell out of me. Long Xander/Faith-centric crossovers with L&O:SVU, Alias and Stargate SG-1 (plus a few oddballs like Gilmore Girls, no, I'm not kidding) work ridiculously logically and with really wonderful characterization (including an adorable gang of OC Slayers and some Watchers) and dialogue. Also, there's Weiss-ness, which is always going to suck me in. The SG-1 story isn't finished yet, but there's a lot to read before you hit that point. Give it a try.

Harry Potter and the Key of Dagon by Don Sample
[Buffy the Vampire Slayer/Harry Potter]
Okay, this is not great art. It's quite indulgent, a little light on plot, and generally fluffy. But it's also one of the more intelligent Buffy/HP crossovers I've run across and the author intended it that way, so, major points. The universes are integrated with a fair amount of thought and all of the characters sound like themselves; you're going to get a lot of rehashing of Buffy and HP plots, but they're integrated well into dialogue and storytelling. And it's fun. Instead of angsting all over the place, people are happy and getting along and enjoying themselves (mostly), which is reason enough to read this, even if you think Dawn taking Draco's wand away from him and wearing it in her hair for a week isn't. (I think it totally is, but that could just be me.) Some shippiness, but only one pairing gets any focus (and no, I'm not telling you which one it is, except that it's het). Give it a shot.

When Hellmouths Collide by Kimberley Rector and Martha Wilson
[Buffy the Vampire Slayer/Hercules: The Legendary Journeys]
No, I'm not kidding. This ranks in my personal list as the most brilliant crossover of all time. The two mythologies are integrated seamlessly, logically and consistently with both universe's rules; the plot is twisty and complex, with both universe's villains represented; there's action, adventure, romance and humor; and every single character is written with dead-on accuracy and affection, the dialogue truly perfect. Go. Read. Now. You can thank me later (and you will).

Slayer by Scribe
[Buffy the Vampire Slayer/The Magnificent Seven]
Unlikely, yes. But trust me, this one is worth the effort -- the prose needs a little polishing, but the dialogue is excellent, the characterizations are dead-on, and the situation bounces between scary and hilarious. Spike runs afoul of a time-altering demon, and has to go back in time to save one of Buffy's ancestors before he can be killed. Which of the Seven is it? Well, you'll just have to read to find out....

Runaway Trains at 3 a.m. by C.L. Kamnikar
[Buffy the Vampire Slayer/Smallville]
It's not like I'm objective about Kiki's writing, but everyone else in the universe has recced this one, so I feel confident in my own. Pop Quiz Question of the Day: If a supernatural teenager from Sunnydale, California heads east at 70 mph, while a super-powered teenager from Smallville, Kansas is heading west at 65 mph, at what time will they meet up in a Greyhound bus station in Denver? Just in time for some lovely interaction between two unlikely people, a couple of great cameos, and one of the most solidly characterized crossovers you'll ever find. Don't miss the sequel, Lines of Communication.

Sailor's Delight by General Jinjur
[Buffy the Vampire Slayer/Stargate Atlantis]
A post-apocalyptic crossover, serious and sober and chillingly atmospheric. Dawn wakes to find the world has ended; as she heads alone for California, she stumbles across Jeannie McKay Miller. It totally works.

Donna the Vampire Slayer by Nomad
[Buffy the Vampire Slayer/The West Wing]
I keep running into crossovers that make me spit with jealousy for not being able to do that, and Nomad's Donna the Vampire Slayer is one. Yes, you read the title correctly; yes, it's a West Wing/Buffy crossover. Just accept that there are vampires in Washington DC (which shouldn't come as news to anyone who watches CSPAN), and let the story carry you from there. Nomad integrates the two universes with a fine balance of absurd humor and occasional near-total seriousness, coupled with dead-on characterization and dialogue -- if the Senior Staff found out vampires were real, this is how they would react. And don't get me started on what happens to Sam in the sequel...

The Scarab by BK the Irregular
[Buffy the Vampire Slayer/Stargate SG-1]
Many have tried, most have failed, then Bruce came along with The Scarab. Using the remains of the Initiative and Riley himself, Bruce not only crosses over the two universes of Buffy and Stargate SG-1 seamlessly, he does so with a tight, twisty plot, excellent characterization, dialogue that is dead-true to both shows, and a sense of humor about the whole thing that never quits. Definitely on my top ten list of all-time best crossovers, probably more like the top five -- I loved it so much, I made him a web page.

Bridges by Tassos
[Buffy the Vampire Slayer/Stargate SG-1]
Two of the most overused cliches in fanfic collide: Xander's Real Father and the dreaded Stargate/Buffy crossover. But surprise, surprise, this one's really good! After the collapse of Sunnydale, Jack O'Neill receives a call about a will -- and a son he never knew he had. Meanwhile, Xander Harris is trying to babysit a herd of Slayers in Cleveland, when a man shows up on his doorstep.... The characterization on Jack and Xander is dead-on perfect, with everyone else running around nicely dilineated. The blend of the two universes is also well executed and, while the grammar is occasionally questionable, the ability of the writer never is. KikiRec

The Date Series by LastScorpion
[Buffy the Vampire Slayer/Smallville]
In a nice little alternate universe, Dawn and Clark wind up at college together, and somehow talk Lex and Buffy into a Double Date. The series takes off from there, expanding a short one-shot into two longer, plottier sequels building the relationships between all four characters with excellent characterization and a real love for both universes. It's not deep and makes no pretense of being so, but it is well-done and absorbing, getting better with every story. LastScorpion's universe is an improvement on the ones offered to us by canon. Even better, she AUs herself with World of Perpetual Wednesday, World Without Superman, in which two entirely different Lex Luthors find themselves with another dimension's Dawn Summers in the Sunnydale of a fourth universe altogether. Getting there wasn't exactly what any of them had in mind, and getting back home is only half the fun.

Past Improbable by sixth_light
[Doctor Who/Torchwood/Bones]
Yes, you read that right; I couldn't make up a crossover this whacked if I tried. And it's good! The situation is wildly improbable, of course, but everyone treats it so seriously that you have to as well -- when you're not giggling hysterically at the crackling dialogue snapping back and forth between all the characters. sixth_light somehow integrates the running plot arcs of Brennan's past with Jack Harkness's, and then the TARDIS shows up to reunite with Jack and join the fun. The universes are integrated beautifully and quasi-logically, you get enough backstory to keep up even if you don't know one of the shows, and the voices? So. Frelling. Awesome. (I link to Part 13; the first 12 parts are linked at the top.)

Hello, Major Tom by themonkeycabal
[Doctor Who/Farscape]
We should all get holiday presents like this, because watching Crichton have a close encounter with the TARDIS Trio? Priceless. Jack's reaction to meeting his all-too-human hero is lovely, and watching Crichton and the Doctor snark at each other is a hell of a lot of fun. Very, very cool.

Persistant Mysteries by Shaye
[Farscape/Firefly]
When Serenity's crew stumbles onto an ancient cryochamber in an ancient bunker, they don't expect to find someone alive inside of it -- or for that someone to be a Nebari thief so very far from home. This isn't the easiest of crossovers, but Shaye pulls it off through sheer power of emotion. Her Chiana and River are amazing, and everyone else shines as well. Gorgeous.

A Million Light Years From Home by Victoria P.
[Firefly/Harry Potter]
Kaylee brings a big black dog back to the ship, but he's much more than he seems -- a wizard far from home. Post-Serenity and Order o the Phoenix, an unlikely crossover blended together just beautifully. Serenity's crew seen through Sirius' eyes is a wonderful thing.

Change Is the Only Constant by Mara Greengrass
[House/Batman]
When Bruce Wayne becomes Dr. Gregory House's latest patient, House's hidden past might just be disclosed -- and you're gonna do a spit-take when you realize what that past is! I know what you're thinking, but Mara makes it work. Seriously. Both of the universes are somehow integrated, House's voice is dead-on, and the DC cast plays exactly as they should. So very beyond cool.

Hallowed Be Thy Greg by Suzvoy
[House/Joan of Arcadia]
It's just a short, inoffensive little crossover -- that will leave you on the floor rolling around and dying of laughter. Suz nails both of her characters and the result is snarkily hilarious.

Go-Cart Charlie by Red Soprano
[Medium/NUMB3RS]
A nifty crossover, as Allison's family vacation to Disneyland gets derailed by a persistant ghost, trying to save her son's life. Charlie isn't what Allison expects to find, but the ensuing relationship between the two families as they track down a saboteur is fun and touching. If you've seen either show, give it a shot.

Parrot by penknife
[Pirates of the Caribbean/Harry Potter]
Yes, you read that correctly and yes, it does work ridiculously well. Jack Sparrow at Hogwarts. You may begin being terrified now. (Also read Pieces of Eight for some gorgeous (non-crossover) post-AWE snapshots.)

Five Muppets Isaac's Pretty Sure He Never Hired by Amy (fox1013)
[Sports Night/The Muppet Show]
CrackFic! Oh my god! Hilarious, startlingly in-character, screamingly funny crackfic! Amy takes it just seriously enough to make it all the more howlingly funny. Example: "Dan's face fell. 'She's just- she's a really neat pig, is all. And you'll hurt her.'" Continue from there. Trust me.

Crooked Paths by themonkeycabal
[Stargate: Atlantis/Farscape]
themonkeycabal simply has one of the deftest crossover touches I've run across. This one pits Rodney McKay against the Uncharted Territories and his old college rival -- John Crichton. John, Rodney and Aeryn are all beautifully voiced, the Farscape universe is lovingly portrayed, and the interactions are just wonderful.

Drink Up, Look at the Stars by Kuwdora
[Stargate: Atlantis/Farscape]
A way-cool meeting between John Crichton and John Sheppard during the former's visit to Earth. Sheppard's POV on Crichton is really nicely done, and seeing Moya, Pilot and the others through his eyes is a real treat. 2005 Multiverse Ficathon. KikiRec

The Big Bang and Everything After by cgb
[Stargate: Atlantis/Firefly]
It's one of those pairings you find it impossible to believe will work until someone pulls it off, but this is, in fact, McKay/River. I know, surprised the hell out of me, too. But cgb does a lovely job with River's POV, and McKay is touching as a man pulled out of his own time. 2005 Multiverse Ficathon. KikiRec (I had this wrongly attributed for the longest time, and I deeply apologize.)

Clarke's Law by Isis
[Stargate: Atlantis/Harry Potter]
Just for you, Dad -- a really off-the-wall, beautifully executed crossover. Carson Beckett makes a discovery tying back to his school days that might be the key to defeating the Wraith. However, since the school in question was Hogwarts, this might not be as simple as it sounds. Isis does a wonderful job of integrating the rules of the two universes, both in the plot and through the characterization. Her Carson POV never falters, and she handles the rest of the characters with an equally deft touch. Just wonderful.

Highly Classified and Very Hush-Hush by rageprufrock
[Stargate Atlantis/NCIS]
Naked Marines appearing out of thin air do not make Gibbs a happy man. Particularly when their base commander is an Air Force colonel, and none of this makes any sense. I believe I speak for much of fandom when I say, "Thank god, now I don't have to write this."

Classified by Dira Sudis
[Stargate: Atlantis/NUMB3RS]
Dira attempted one of those crossovers you never think could work and pulled it off in gorgeous style by simply not forcing it too hard. The circumstances make perfect sense, the characterization is achingly on-target, and Don's POV is beautiful. Very real in ways you wouldn't expect going in, and just awesome.

The Roads of the World by celli
[Stargate: Atlantis/Supernatural]
Another of those weird little crossovers that works insanely well not by not pushing it too hard. Celli's Dean is perfect; a little lost and a little broken, but finding someplace where he fits. (And she's working on a sequel! And it's gonna be cool!)

Pathways by Tassos
[Stargate SG-1/Farscape]
Tassos has a really deft hand with crossovers, and this is another good one; she integrates the wormholes of the two universes in a way that not only makes perfect sense, but builds a great framework for her story. The characters are integrated equally nicely; it's a fun romp and an impressive achievement.

Actualize This! by Helena Handbasket
[Stargate SG-1/Sentinal/Invisible Man]
I was force-fed three episodes of Sentinal, and felt no desire to return. I'm not happy about Daniel coming back to Stargate. And I could not figure out how Darien and Bobby could interact with any of the above. So it was with great skepticism that I entered into this crossover. Within three paragraphs, I was laughing like a loon. The dialogue is too funny for words, and the takes that all six of these men have on each other are snarky and perceptive and truly hilarious. Forced by various commanding officers to attend a "partnership-building" seminar in Canada, they stumble (of course) into a Secret Plan, which they must proceed to thwart in their own inimitable ways. Even if you've only seen one or two of the shows, don't let that stop you -- this is priceless stuff. And it's not slash!

Ekphugion by Shaye
[Vorkosigan/Battlestar Galactica]
The Galactica has finally found another world of humans -- warlike humans with itchy trigger fingers, but humans nonetheless. Now the Viceroy and Vicereine of Sergyar have to figure out what to do with them. Dead-on characterization throughout, a humorous, realistic look at the challenges of first contact, and a damn fine plot that will suck you in and pull you through any disorientation. Marvelous. 2005 Multiverse Ficathon.

Marks and Scars by E. H. Smith
[Vorkosigan/Harry Potter]
Yes, you're reading that correctly. Erica pulled off a miracle, crossing over a deep fantasy universe with an equally deep science fiction universe (separated by 1,000 years, no less), and doing it in style. Professor Snape makes one little wish -- "Show me one man more wretched than I." -- and finds himself with an unexpected visitor in the form of Mark Vorkosigan. Saying the pair of them bond doesn't quite cover it... The story continues in Without Enchantment and No Great Magic, and treats you to truly excellent characterization of all parties concerned along the way. Words cannot praise these stories highly enough.

Time Shall Not Mend by A.J. Hall
[Vorkosigan/Harry Potter]
Erica laid down the challenge, and A.J. picked up the gauntlet, continuing in the universe her crossovers created. With style. Ekaterin Vorkosigan wishes to be anywhere but here, and finds herself coming to the aid of two young wizards on a planet long ago and far away. Then Draco Malfoy returns the favor. The summary doesn't do it justice, because nothing could; just accept that A.J.'s gift for making Draco likeable without fundamentally changing him really comes through. One or two characterization quibbles on one or two people; the rest are simply wonderful (I adore his Ivan).