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The Alterans Resurgence by Michael Donovan2 reviews
The 12 colonies origins are not what they seem and now those who came before look on and decide to change the outcome.
Crossover - Stargate: SG-1 & Battlestar Galactica: 2003 - Rated: T - English - Sci-Fi - Chapters: 27 - Words: 78,776 - Reviews: 147 - Favs: 99 - Follows: 144 - Updated: 8/5 - Published: 6/6
Build an Empire Harry, or get killed in the process by fvdv123 reviews
Old Guy's Soul replaced Harry's by a Glowy Ascended from SG1. Now he has to use all his knowledge of the books and TV shows to survive and thrive. Harem, of course, a bit of Cringe, some Tropes, and Gary Stu with an OP SI Soul kicking ass. We let Daphne rest a bit, she is exhausted from the other stories she starred in. This story was nagging in my head and had to come out.
Crossover - Stargate: SG-1 & Harry Potter - Rated: M - English - Humor/Sci-Fi - Chapters: 13 - Words: 61,245 - Reviews: 187 - Favs: 508 - Follows: 692 - Updated: 8/5 - Published: 7/14 - J. O'Neill, Harry P., Padma P., Lavender B.
Robotech: The Stargate Saga Version 21 by andrewjameswilliams reviews
Rewrite of Robotech: The Stargate Saga. As robotechnology changed humanities destiny a chance discovery beneath the Giza Plateau reveals an Ancient legacy and a deadly ancient threat.
Crossover - Stargate: SG-1 & Robotech/Macross - Rated: T - English - Chapters: 12 - Words: 65,944 - Reviews: 32 - Favs: 89 - Follows: 99 - Updated: 8/4 - Published: 4/25 - S. Carter, D. Jackson, Rick/Hikaru
Doorways by Mirrored Illusions reviews
The Slayer and half of SG-1 both intended to go somewhere specific that was most definitely not the ice cave they ended up in. (AFAD 2024)
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: T - English - Chapters: 3 - Words: 2,424 - Reviews: 3 - Favs: 10 - Follows: 17 - Updated: 8/4 - Published: 8/1 - Buffy S., S. Carter
Stargate Atlantis Trading Grounds I: The Return To La Rochelle by BazzCatgirl03 reviews
After surviving a fatal assault at his apartment, Daniel Jackson is transferred to the SGA, under the military command. And of General Hank Landry, deciding this is the chance to start his life over. As he and Teal'C, after the cruel and cold blooded betrayal the year before. Of their team, they leave the SGC and start a new life. Alternate Forever In A Day main character bashing.
Crossover - Stargate: SG-1 & StarTrek: The Next Generation - Rated: T - English - Sci-Fi/Angst - Chapters: 171 - Words: 1,790,060 - Reviews: 4 - Favs: 10 - Follows: 13 - Updated: 8/4 - Published: 1/23 - J. Picard, D. Jackson, Teal'c, Gen. Landry - Complete
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: 150 - Words: 1,025,525 - Reviews: 392 - Favs: 193 - Follows: 213 - Updated: 8/3 - Published: 9/25/2021 - [Adora/She-Ra, Catra] S. Carter, J. O'Neill
The Defensive Space Force Ship Requirement by tkepner reviews
Harry Potter, and the rest of Dumbledore's Army in his fifth year, use the Room of Requirement to get themselves a spaceship! The problems of a tiny island on Earth don't seem so important, anymore. Wizards in Space! What could possibly go wrong with that? Eventually, this will be a crossover with Stargate SG-1.
Crossover - Stargate: SG-1 & Harry Potter - Rated: T - English - Fantasy/Sci-Fi - Chapters: 55 - Words: 343,266 - Reviews: 2598 - Favs: 3,290 - Follows: 4,142 - Updated: 8/2 - Published: 12/11/2021 - Gen. Hammond, Harry P., Hermione G., Lee J.
HALO-STARGATE: All the Stars in the Sky: Book I by Spartan-076A reviews
The UNSC will have to navigate a galaxy poised to rip itself apart between the ambitions of the System Lords and the scheming of the San'Shyuum Hierarchs. Will humanity triumph and rise victorious from these trials, or will it fall by the hands of its enemies? Only time will tell.
Crossover - Stargate: SG-1 & Halo - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 1,752 - Reviews: 2 - Favs: 8 - Follows: 19 - Published: 8/1 - S. Carter, Gen. Hammond, J. O'Neill, Master Chief/John-117
Sisters, the adventures of Samantha and Buffy Carter by FPBarbieri reviews
Samantha Carter, prodigy. Buffy Carter Summers, loving little sister. The story of their lives, together and apart.
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: T - English - Drama/Family - Chapters: 33 - Words: 97,872 - Reviews: 16 - Favs: 29 - Follows: 46 - Updated: 8/1 - Published: 6/1/2021 - S. Carter
Stargate: Universal Collision by Strikefreedom10 reviews
After a horrible hyperspace jump following the destruction of Orilla, SG-1, Stargate Command and Atlantis all find themselves facing a brand new universe as their own galaxy is irrevocably changed. New allies, new enemies and new challenges all await as universes collide with one another in a battle just to survive.
Crossover - X-overs & Stargate: SG-1 - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 28,570 - Reviews: 58 - Favs: 145 - Follows: 175 - Updated: 7/31 - Published: 8/19/2019 - S. Carter, J. O'Neill, Thor - Complete
Humanity's Resurgence by Strikefreedom10 reviews
Two different humanity's. Both pushed around by aliens for far too long. Together, they shall show this third universe that humanity is not to be underestimated.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 26,769 - Reviews: 96 - Favs: 236 - Follows: 284 - Updated: 7/31 - Published: 4/1/2019 - S. Carter, J. O'Neill, Master Chief/John-117, T. Hood - Complete
An Unstoppable force Meets an Immovable Object by RusticItalian reviews
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: 9 - Words: 11,081 - Reviews: 15 - Favs: 73 - Follows: 105 - Updated: 7/30 - Published: 1/15 - Xander H., S. Carter, D. Jackson, J. O'Neill
Star Trek Tempest: Rediscovering the Gate by Bigtex91 reviews
A Crossover between Star Trek and Stargate SG-1, Atlantis and Universe. In the year 2412, the USS Tempest and her crew find themselves discovering a past that humanity covered up since before the discovery of the Warp Drive. Characters based off of bridge officers from Star Trek Online, and long term Star Trek Roleplays
Crossover - StarTrek: Other & Stargate: SG-1 - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 9,341 - Reviews: 4 - Favs: 22 - Follows: 26 - Updated: 7/28 - Published: 11/22/2023
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: 53 - Words: 261,464 - Reviews: 836 - Favs: 457 - Follows: 539 - Updated: 7/27 - Published: 3/19/2017 - J. O'Neill, W. Adama
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: 65 - Words: 431,809 - Reviews: 229 - Favs: 44 - Follows: 58 - Updated: 7/27 - Published: 3/4/2021
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: 25 - Words: 122,979 - Reviews: 176 - Favs: 347 - Follows: 433 - Updated: 7/27 - Published: 10/12/2022 - [Hakuno K., Gilgamesh] J. O'Neill, Ba'al
Destiny Among The Stars by Emperor Augustus I reviews
When I found myself in this new life, with the opportunity to shake the future as I foresaw it, I knew that I would need more than just being the son of Richard Hillard. No, I was going to remind everyone through not only my success, but that of all of mankind that our destiny was among the stars not the muck of infighting and corruption that was our world. (SI/OC)
Crossover - Stargate: SG-1 & For All Mankind - Rated: M - English - Sci-Fi/Adventure - Chapters: 6 - Words: 16,324 - Reviews: 33 - Favs: 63 - Follows: 79 - Updated: 7/26 - Published: 7/18 - S. Carter, OC
Stargate- SGi by Kalissa55
Part 3 in Mia's adventures. This time, she finds herself in an alternate universe with no idea how she got there. Will those who are part of the Stargate program help her? Will Ironman or the X-Men come to her rescue?
Crossover - Stargate: SG-1 & Ironman - Rated: K - English - Adventure - Chapters: 5 - Words: 24,310 - Favs: 8 - Follows: 13 - Updated: 7/18 - Published: 3/3 - Complete
Mini Gate by Kody Wright 2 reviews
Multi crossovers. SG-1 is slung back to 1984 after the hiccup with the stargate. They discover a much smaller gate hidden in cave in the Mojave desert as a result and an unknown alien influence.
Crossover - Stargate: SG-1 & Airwolf - Rated: K+ - English - Adventure/Sci-Fi - Chapters: 19 - Words: 31,555 - Reviews: 20 - Favs: 10 - Follows: 19 - Updated: 7/18 - Published: 4/16
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: 7 - Words: 28,587 - Reviews: 92 - Favs: 269 - Follows: 336 - Updated: 7/8 - Published: 6/24/2019 - T. Lasky, S. Carter
Wonderland 3: Pool of Tears by Brenna's Urbangirl Projects reviews
With the destruction of the Death Star. Dawn and Buffy have returned to Earth. A month after the United Nations vote to join the New Republic. Jedi Master Dawn (Summers) Skywalker and Padawan Faith (Lehane) Skywalker arrive at the SGC and the war with the Goa'uld will never be the same.
Crossover - Buffy: The Vampire Slayer & Stargate: SG-1 - Rated: T - English - Sci-Fi/Adventure - Chapters: 3 - Words: 25,828 - Reviews: 6 - Favs: 33 - Follows: 51 - Updated: 7/8 - Published: 5/15/2016 - [Dawn S., Faith L.]
Space Wizards: Dawn of the DSF by yoden reviews
A sequel to Esama's "Wizards IN SPACE" on Ao3. As the crew of an alien spaceship, Harry and the DA must make their own place in a world torn by war. Between discovering the secrets of alien tech, creating their own, fighting for survival and building up an international organization, they are up for an interesting year.
Crossover - Harry Potter & Stargate: SG-1 - Rated: T - English - Adventure/Drama - Chapters: 19 - Words: 102,935 - Reviews: 123 - Favs: 358 - Follows: 502 - Updated: 7/7 - Published: 11/11/2020 - Harry P., Albus D. - Complete
Through the Gates of Babylon by Lord-Malaki2036 reviews
An Earth Alliance expedition stumbles upon a discovery that will change the history and the future of them and other races for the foreseeable future.
Crossover - Babylon 5 & Stargate: SG-1 - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 12 - Words: 102,189 - Reviews: 44 - Favs: 108 - Follows: 135 - Updated: 7/5 - Published: 10/10/2022
Magic by Kody Wright 2 reviews
Crossover with Harry Potter. OC, AU. Sam's old friend from her childhood comes to the SGC with a secret. Professor Snape is trapped off world protecting kids from Morgan Le Fey. Jack finds out he can do magic.
Crossover - Stargate: SG-1 & Harry Potter - Rated: K - English - Chapters: 6 - Words: 14,941 - Reviews: 11 - Favs: 31 - Follows: 48 - Updated: 7/4 - Published: 2/7
This Way Atlantis by Una Spectre reviews
When the Seaquest crew find a box that relates to Atlantis the SGC sends their specialist, Arianna Jackson, to authenticate the find. Wary of her at first Bridger soon has to rely on her expertise in all things Atlantis while Ari struggles to live up to her father when they find themselves lost with no way home.
Crossover - Stargate: SG-1 & SeaQuest - Rated: T - English - Sci-Fi/Friendship - Chapters: 19 - Words: 45,493 - Reviews: 13 - Favs: 27 - Follows: 40 - Updated: 7/4 - Published: 7/12/2014 - [D. Jackson, Sha're] OC, Lt. Tim O’Neill - Complete
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