Stargate: SG-1 Crossovers
Filters
3.2K | Page 1 2 3 4 11 .. Last Next »

Slayer Scrolls by Ellmarr reviews
Can two children who are just learning to survive save the worlds or do the Fates have other plans for them- a Multi-Cross Over events - Buffy the Vampire Slayer, Stargate SG-1, TMNT, Gargoyles, Criminal Minds, Skyrim, Supernatural. Takes place just before the defeat of the First. Check back continually as I will be doing Chapters for better flow, fixing grammar, and other things.
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: M - English - Adventure/Sci-Fi - Chapters: 38 - Words: 349,924 - Reviews: 5 - Favs: 29 - Follows: 30 - Updated: 1h - Published: 1/27/2023 - Faith L.
Stargate:Spartan Siege by Johnnieboy11 reviews
After the battle on Mantle's Approach, the Chief finds himself, alongside a non-rampant Cortana, helping the Humans of a galaxy similar, yet different to his own, battle their enemies, while exploring the countless worlds tied together by a network of ancient portals and uncovering the mysteries surrounding these worlds.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 21,904 - Reviews: 83 - Favs: 430 - Follows: 630 - Updated: 1/17 - Published: 12/24/2020 - D. Jackson, J. O'Neill, Teal'c, Master Chief/John-117
The Past Meets The Future III: New Future Reveals by BazzCatgirl03 reviews
With the missions the team had done, SG-1 and their friends prepare and wait for the countdown to end. Only to discover a shocking truth about Jack O'neill and Janet Frasier's involvement in the NID. And with it one that could change the course of history in the tv show history focused on them now. Can they fix that past mistake or will the future for SG-1 play out in the same way.
Crossover - StarTrek: The Next Generation & Stargate: SG-1 - Rated: T - English - Sci-Fi/Hurt/Comfort - Chapters: 77 - Words: 815,460 - Reviews: 3 - Favs: 23 - Follows: 22 - Updated: 1/16 - Published: 11/10/2018 - J. Picard, Gen. Hammond, D. Jackson, Jacob C. - Complete
The Meaning of Strength by wlfgang213 reviews
In an attempt to change the future, Xander is influenced to wear a different costume on Halloween, leading him to use his head instead of his fists in his war against the darkness. YAHF. DCAU Costumes, Stargate SG1 Crossover, and a surprise crossover.
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: T - English - Supernatural/Adventure - Chapters: 2 - Words: 7,925 - Reviews: 20 - Favs: 162 - Follows: 238 - Updated: 1/15 - Published: 6/18/2020
Robotech: The Stargate Saga by andrewjameswilliams reviews
As robotechnology changed humanities destiny so does a chance discovery beneath the remains of the Giza plateau revealing both an ancient legacy and an ancient threat.
Crossover - Stargate: SG-1 & Robotech/Macross - Rated: T - English - Sci-Fi/Adventure - Chapters: 52 - Words: 266,092 - Reviews: 414 - Favs: 340 - Follows: 369 - Updated: 1/15 - Published: 5/23/2022 - S. Carter, D. Jackson, Rick/Hikaru, Claudia
An Unstoppable force Meets an Immovable Object by RusticItalian
Ethan remembers better times, and it gets interesting A little nostalgia can be a good thing, a lot of nostalgia might just save the planet. Halloween Inspired Cross-Over between Buffy-verse and Stargate Sg1
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: M - English - Sci-Fi/Adventure - Chapters: 1 - Words: 846 - Favs: 3 - Follows: 3 - Published: 1/15 - Xander H., S. Carter, D. Jackson, J. O'Neill
Roads Paved in Shadows by AlbertG reviews
"We don't have information on the numbers yet, sir," one of the commanders answered quickly. "It's not the Cylons. The Thirteenth Tribe is attacking us. We're at war with Earth." Adar was completely stunned that emotion quickly turning into a burning rage. "But why?" he snarled as his rage turned into a need for vengeance.
Crossover - Stargate: SG-1 & Battlestar Galactica: 2003 - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 42 - Words: 205,735 - Reviews: 651 - Favs: 415 - Follows: 486 - Updated: 1/14 - Published: 3/19/2017 - J. O'Neill, W. Adama
The restoration of the UNSC by Warwolff2003 reviews
Reach has Fallen and the newly promoted Captain Jacob Keyes has taken his small fleet and st course for Earth. However, this is not the Earth those in the UNSC remember. This is my version of a similar story by originally by Samsara Sage which was adopted by Ultimate Deathsaurer 2
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Sci-Fi - Chapters: 14 - Words: 71,762 - Reviews: 123 - Favs: 250 - Follows: 361 - Updated: 1/14 - Published: 12/22/2022 - S. Carter, J. O'Neill, Master Chief/John-117, J. Keyes
Stargate Etheria by Starfox5 reviews
Entering a gate leading to an unknown planet while dodging fire wasn't too uncommon for SG-1. Meeting strange new people wasn't unusual either for the Best Friends Squad. But figuring out how to deal with each other, the remnants of the Horde Clones and the Goa'uld threat without a D.H.D. for the Stargate on Etheria? That was new for both.
Crossover - Stargate: SG-1 & She-Ra and the Princesses of Power - Rated: T - English - Adventure/Sci-Fi - Chapters: 121 - Words: 828,693 - Reviews: 303 - Favs: 185 - Follows: 196 - Updated: 1/13 - Published: 9/25/2021 - [Adora/She-Ra, Catra] S. Carter, J. O'Neill
Celeste by Amelia E. Adler reviews
Continuation of Midnight Blue, Azure, and Shades of Blue: Intermission. After returning to her own timeline, Alice Boyd has to deal with the fallout. Chasing and confronting her nemesis will only be a part of her struggle; more than anything, she will have to face her own emotions, and who knows where they'll lead her in the end... OC with no AU - futurefic.
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: T - English - Sci-Fi/Adventure - Chapters: 55 - Words: 368,237 - Reviews: 181 - Favs: 41 - Follows: 56 - Updated: 1/12 - Published: 3/4/2021
How Dr Lee found the Furlings by LittleMiddleA reviews
Who would of thought that the magazine Aliens Among Us! would ever be useful?
Crossover - Animorphs & Stargate: SG-1 - Rated: T - English - Humor/Adventure - Chapters: 2 - Words: 4,487 - Reviews: 1 - Favs: 6 - Follows: 8 - Updated: 1/9 - Published: 12/25/2023
Requiem VI by bearhug562000
As our heroes close in on the final solution to defeating the Darkness and its dead hordes, they are unaware that their enemies are hot on their respective tails!
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: M - English - Fantasy/Sci-Fi - Chapters: 7 - Words: 14,538 - Favs: 1 - Follows: 2 - Updated: 1/8 - Published: 1/6/2023 - Buffy S., Faith L., J. O'Neill, Teal'c - Complete
Waking into a Dream by stargatesg1fan1 reviews
An SI story where our main character wakes up as a young Harry Potter. Watch as our SI finds himself in a universe slightly different from canon Harry Potter and makes the changes he wants to make. Later also realizing Stargate exists in this universe he makes even more changes. Eventual-Powerful-Harry. Gary Stu. Lots of Smuttiness. Multi-Pairing. Pairing: HG/HP/Sam Carter
Crossover - Stargate: SG-1 & Harry Potter - Rated: M - English - Adventure/Romance - Chapters: 1 - Words: 10,426 - Reviews: 36 - Favs: 310 - Follows: 412 - Published: 1/7 - S. Carter, Harry P., Hermione G.
Terra s Destiny: A prelude to War by GeneralAllenWalker reviews
Jack O'Neill thought he had done enough to earn a retirement. Fighting the russians in east germany, killing an alien god in a distant star system thousands of light years away, being a productive member of the Colorado Springs golf club, all very laudable things, if he allowed himself the compliment. Sadly, it seems, the universe had other ideas as Earth faces an Enemy Unknown
Crossover - Stargate: SG-1 & X-Com - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 8,063 - Reviews: 5 - Favs: 7 - Follows: 12 - Updated: 1/1 - Published: 12/15/2023 - S. Carter, J. O'Neill
Stargate A New Age by kaln7 reviews
Shepard defeated the Collectors, but now he must face a universe different from his own, but his team won't be the only team to help him get through this uncertain future.
Crossover - Stargate: SG-1 & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 17 - Words: 151,582 - Reviews: 172 - Favs: 287 - Follows: 403 - Updated: 1/1 - Published: 4/6/2017
SG Universes at War by celian Cogitore reviews
In a parallel universe, the Tau'ri faces a bloody war between the Systems Lords Anubis and Apophis. The situation is affected by the arrival of a strange character: 'Gilgamesh, the King of Heroes'. The Golden King is looking for Hakuno Kishinami (F) his 'Master'... and woe to the one who will cross his way, that they are false gods or whole aliens civilizations.
Crossover - Stargate: SG-1 & Fate/stay night - Rated: T - English - Sci-Fi/Supernatural - Chapters: 20 - Words: 96,635 - Reviews: 159 - Favs: 300 - Follows: 385 - Updated: 12/29/2023 - Published: 10/12/2022 - [Hakuno K., Gilgamesh] J. O'Neill, Ba'al
Reborn a Worm by feauxen reviews
Taylor Hebert just can't get a break. She retired to a peaceful alternate Earth after the horror show that was Golden Morning, but Contessa didn't bother making sure she lived to reach old age. And someone seems to be pulling strings behind the curtain, because this definitely isn't the afterlife...
Crossover - Stargate: SG-1 & Worm - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 20,734 - Reviews: 107 - Favs: 538 - Follows: 738 - Updated: 12/27/2023 - Published: 3/24/2022 - Gen. Hammond, J. O'Neill, Skitter
Gundam Seed: A New Path by readerofgoodfanfiction reviews
The Second Bloody Valentine's War has ended. In the midst of it all, the Atlantic Federation forms a top secret military division called Stargate Command located deep within the heart of Cheyenne Mountain, Colorado. The discovered Ancient relic, the Stargate, help raise back a nation from the ashes of its defeat like a phoenix and shows the galaxy what it truly means to be Tau'ri.
Crossover - Stargate: SG-1 & Gundam Seed - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 27 - Words: 159,843 - Reviews: 254 - Favs: 236 - Follows: 240 - Updated: 12/25/2023 - Published: 7/14/2011 - OC
Stargate: Valkyrie (Revision 5) by Brenna's Urbangirl Projects reviews
Summary: On that fateful Halloween night. Buffy, Xander, Willow, Dawn, Cordelia, Giles, Jenny Calendar and Tara Maclay would be given a new destiny. Along with that destiny they would be given a 3 space going vessels in which to help fight the Goa'uld.
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: T - English - Supernatural/Sci-Fi - Chapters: 19 - Words: 69,452 - Reviews: 44 - Favs: 180 - Follows: 257 - Updated: 12/22/2023 - Published: 12/8/2021 - Xander H., Buffy S., Dawn S., Willow R.
Harry Potter and the Enforced Holiday by tscchope reviews
Harry is sent on holiday and meets Jack O'Neill. I've switched Bane and Secrets episode order, but had Sam learn of her father's illness. Set after the Battle of Hogwarts and follows the crapilogue, somewhat. Jack and Sam will be getting together. For Jack it's sort of a family tradition, for Sam it's her dad's imminent demise that forces her to think about being a mother.
Crossover - Stargate: SG-1 & Harry Potter - Rated: T - English - Sci-Fi/Family - Chapters: 6 - Words: 34,351 - Reviews: 34 - Favs: 146 - Follows: 225 - Updated: 12/21/2023 - Published: 2/14/2023 - S. Carter, J. O'Neill, Harry P., Hermione G. - Complete
Stargate SG-Kat: First Contact by ElohimEditor reviews
Following Ba'al's execution, a new Goa'uld has emerged to threaten the entire galaxy. With its traditional alliances somewhat fragile, and the Wraith and Lucian Alliance on the prowl, the SGC must seek new allies.
Crossover - Stargate: SG-1 & SWAT Kats - Rated: T - English - Adventure/Sci-Fi - Chapters: 4 - Words: 22,103 - Reviews: 1 - Favs: 5 - Follows: 6 - Updated: 12/20/2023 - Published: 11/17/2023
The Black Stone by Kody Wright 2 reviews
On the eve of disclosure about the Stargate, SG-1 finds an rock shaped artifact that activates and sends them back to 1985 mentally. Sam and Daniel find themselves as teenagers. Jack a young Captain. The Gate is soon stolen and Colonel George Hammond recruits a team of specialist to get it back. AU. Multi-cross over with 80's tv shows.
Crossover - Stargate: SG-1 & Airwolf - Rated: K+ - English - Chapters: 12 - Words: 28,127 - Reviews: 3 - Favs: 17 - Follows: 27 - Updated: 12/19/2023 - Published: 8/4/2023
Humanité by Audragon reviews
La mort était douloureuse. Et lorsqu'on était Maître de la Mort, elle était aussi pleine de révélations. Mais lorsqu'on l'était, ce passage n'était que le début, le début vers une nouvelle existence dans laquelle la Mort elle même devenait une protectrice offrant une voie d'accomplissement pour celui qu'elle avait choisi...
Crossover - Stargate: SG-1 & Harry Potter - Rated: T - French - Fantasy/Sci-Fi - Chapters: 37 - Words: 301,999 - Reviews: 330 - Favs: 283 - Follows: 291 - Updated: 12/14/2023 - Published: 1/10/2023 - C. Kawalsky, Thor, Harry P.
Forethough and Planning An SG:A Story by ANBU Operative Goat reviews
The Ancients arrived in a new galaxy, forced away from home by their brothers and sisters. Unable to go back to their old home they built a new one, one that could travel amongst the stars. They built it to last for millennia, and it has stood the test of time. When the Tau'ri awaken the city it provides them with much more than they expected, and an enemy far worse than they hoped
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: T - English - Adventure/Sci-Fi - Chapters: 2 - Words: 12,013 - Reviews: 17 - Favs: 60 - Follows: 79 - Updated: 12/14/2023 - Published: 12/4/2021 - Rodney M., John S., Teyla E., Ronon D.
Empires Unite! Milky Way by SapphireDawn11709 reviews
When the SGC Destroys the Quantum Mirror after the incident were Doctor Carter and Major Kawasaki appear in Area 51a ripple was sent across the multiverse. When this ripple hit a Forerunner portal chaos ensues as fleets from three universe appear in the Milky Way. Starship Troopers, Mass Effect, Halo Stargate
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi - Chapters: 5 - Words: 19,869 - Reviews: 57 - Favs: 236 - Follows: 291 - Updated: 12/14/2023 - Published: 6/24/2019 - T. Lasky, S. Carter
3.2K | Page 1 2 3 4 11 .. Last Next »