Stargate: Atlantis Crossovers
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The Other Side of Existence by Starry Bright Light reviews
Alex had settled into his life as an ex-reluctant spy. He went to the local university, kept up with his part-time job, and kept his head down. Unfortunately, that's not good enough for the bad guys still out in the world that want him dead. And after an encounter with a certain Colonel John Sheppard, Alex's perfectly settled, completely normal life is turned on its head.
Crossover - Stargate: Atlantis & Alex Rider - Rated: T - English - Sci-Fi/Adventure - Chapters: 43 - Words: 169,013 - Reviews: 74 - Favs: 66 - Follows: 63 - Updated: 12/25 - Published: 4/1/2022 - Rodney M., John S., Alex R./Cub
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: 52 - Words: 351,932 - Reviews: 171 - Favs: 40 - Follows: 56 - Updated: 12/21 - Published: 3/4/2021
Opération Atlantis by ManuelaFictions
Une affaire emmène le colonel Sheppard et les siens à enquêter sur terre et faire collaboration avec le 5.0. Comment va se passer cette enquête?
Crossover - Stargate: Atlantis & Hawaii Five-0 - Rated: M - French - Humor/Romance - Chapters: 12 - Words: 27,951 - Updated: 12/21 - Published: 12/18 - Rodney M., John S., Steve M., Danny W.
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: 77 - Updated: 12/14 - Published: 12/4/2021 - Rodney M., John S., Teyla E., Ronon D.
A wizard's adventure by rick001 reviews
Harry's quest to learn about the origin of magic leads him into discovering more of the universe than he could ever imagine and getting into trouble with aliens while unwittingly establishing an empire.
Crossover - Harry Potter & Stargate: Atlantis - Rated: T - English - Adventure - Chapters: 2 - Words: 2,305 - Reviews: 20 - Favs: 122 - Follows: 164 - Updated: 12/13 - Published: 12/6/2016
When Magic and Technology work together by J.K Holdenwood reviews
Just a tryout of what a AI can generate in just 2000 words. Added a new chapter to learn the manager engine. Story gets a bit different as it went to other way i wanted. So ithink i have to make it small tryout single chapters for the time being. edited second chapter to get it readable!
Crossover - Harry Potter & Stargate: Atlantis - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 1,621 - Reviews: 8 - Favs: 5 - Follows: 5 - Updated: 12/13 - Published: 1/14 - Harry P., Hermione G. - Complete
Incursion by andrewjameswilliams reviews
Side story to Robotech: The Stargate Saga. The Wraith have begun an invasion of the Tirolian Empire beginning a new war that will change the universe forever.
Crossover - Robotech/Macross & Stargate: Atlantis - Rated: T - English - Sci-Fi/Adventure - Chapters: 1 - Words: 4,414 - Reviews: 7 - Favs: 23 - Follows: 35 - Published: 11/29
Stargate Atlantis Fire Within by heavyneos reviews
Just as the Atlantis team think they have finally found a reprieve from the Wraith thanks to a fortuitous accident something hidden in deep space and from another world may bring more than one complication to the fight
Crossover - Halo & Stargate: Atlantis - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 20,668 - Reviews: 39 - Favs: 92 - Follows: 124 - Updated: 11/29 - Published: 9/8 - Rodney M., John S., OC
Ancient Flop by MKRG reviews
Vala's valiant attempt to keep McKay out of Daniel's hair takes a hilarious turn. SG1-SGA crossover. Minor DV. Oneshot.
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: K+ - English - Humor/Sci-Fi - Chapters: 1 - Words: 4,922 - Reviews: 1 - Favs: 2 - Published: 11/28 - D. Jackson, Vala, Rodney M., John S. - Complete
Stargate Atlantis: Revan by Spearhead reviews
Fates and Destinies are changed when Revan, the greatest Master of both the Jedi and Sith Orders, is set on a new path by someone from his previous life. The Prodigal Knight and his small team will ally themselves with the Atlantis Expedition to fight the greatest threat known to a galaxy completely foreign to them. But that is only the beginning of the adventure.
Crossover - Stargate: Atlantis & Star Wars - Rated: M - English - Adventure/Sci-Fi - Chapters: 13 - Words: 36,241 - Reviews: 66 - Favs: 103 - Follows: 140 - Updated: 10/31 - Published: 11/1/2022
Letting Her Go by ishiptoomuch
AU. Amanda Tapping once jokingly suggested Teal'c and Sam got together during the fifty years in Stargate SG-1's "Unending." If that happened, here's Teal'c's point of view in Stargate Atlantis: "Reunion" when he says goodbye to Sam.
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: T - English - Friendship/Romance - Chapters: 1 - Words: 1,412 - Favs: 1 - Published: 10/22 - Teal'c, S. Carter - Complete
Portal into Atlantis by StarrFyre reviews
An incoming wormhole drops off an unexpected visitor: Natasha Romanoff, straight from Vormir. This is a super tentative WiP and the title may change. I'm planning on writing more, I hope. Rated K due to canon subject matter, and may change. Takes place early S2 of SGA. Spoilers for SGA and the MCU, specifically Endgame. Please go easy on me. I don't own any of these characters.
Crossover - Stargate: Atlantis & Avengers - Rated: K+ - English - Sci-Fi - Chapters: 5 - Words: 8,448 - Reviews: 17 - Favs: 63 - Follows: 89 - Updated: 10/19 - Published: 3/1/2021 - Elizabeth W., Rodney M., John S., Black Widow/Natasha R.
Robotech: The Stargate Saga Omakes by andrewjameswilliams reviews
A series of omakes and AU shorts set to the backdrop of the Stargate Saga fusion universe.
Crossover - Robotech/Macross & Stargate: Atlantis - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 1 - Words: 2,057 - Reviews: 1 - Favs: 12 - Follows: 15 - Published: 10/13 - Rick/Hikaru, Max, Teyla E., David S./Sheppard
Dangerous Mysteries by Jennifer Schumacher reviews
After a devastating loss, Xander and Cordelia are offered the chance of a lifetime. They left Sunnydale to escape an endless war against vampires. Now they're caught up in an endless war against space vampires. Oh, the irony.
Crossover - Buffy: The Vampire Slayer & Stargate: Atlantis - Rated: M - English - Adventure/Drama - Chapters: 59 - Words: 58,462 - Reviews: 133 - Favs: 81 - Follows: 72 - Updated: 10/6 - Published: 9/23 - Xander H., Cordelia C., Elizabeth W., John S. - Complete
The 30 stories of John Sheppard by ReKoJ
Chapter 1:John has a dream. *Each one has a different prompt and they can all be read as stand alones.
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: M - English - Chapters: 7 - Words: 6,434 - Updated: 9/13 - Published: 8/9
The Reaper And The Wolves by Jennifer Schumacher reviews
The people of Pegasus are being Hunted. An old enemy of the Ancients has found them. Soon the Protectors and AG 1 will be Hunting them.
Crossover - Buffy: The Vampire Slayer & Stargate: Atlantis - Rated: M - English - Adventure/Angst - Chapters: 7 - Words: 6,682 - Reviews: 6 - Favs: 18 - Follows: 13 - Updated: 9/12 - Published: 9/11 - Xander H., John S. - Complete
Wires Crossed by BuggyFiction
In a tumultuous turn of events, John Sheppard finds himself wondering why the Asgard are on this planet and why his supposed dead friend is up in space, too. (This takes place after the series finale of Stargate Atlantis, and after Ziva leaves NCIS, but before her brief return in the later seasons. )
Crossover - NCIS & Stargate: Atlantis - Rated: K - English - Mystery/Sci-Fi - Chapters: 1 - Words: 3,188 - Favs: 6 - Follows: 4 - Published: 9/11 - Ziva D., John S. - Complete
Aliens vs Predators vs Wraith by eng09467
Aliens vs Predators vs Wraith
Crossover - Stargate: Atlantis & Aliens/Predator - Rated: M - German - Sci-Fi - Chapters: 1 - Words: 1,004 - Published: 9/10 - Complete
Stargate Atlantis Wraith vs Predator by eng09467
Wraith vs Predator
Crossover - Stargate: Atlantis & Aliens/Predator - Rated: M - English - Sci-Fi - Chapters: 1 - Words: 1,044 - Published: 9/10 - Complete
The Intern and the Wraith by Red Leader reviews
Prequel to Echoes of the Abyss, UN Secretary General Elect Henry Hayes recruit Sheppard and his team to hunt down a wraith that's feeding on a family of a Senator. Paths cross when they encounter a FBI agent Booth and his Partner Dr. Brennan who seek answers to a mysterious murder.
Crossover - Stargate: Atlantis & Bones - Rated: K - English - Sci-Fi/Mystery - Chapters: 6 - Words: 42,246 - Reviews: 2 - Favs: 5 - Follows: 6 - Updated: 9/7 - Published: 8/17 - John S., Ronon D., T. Brennan, S. Booth
My Friend by Ana's Writings
Book 1 in the "My Friend, My Lover, My Everything". Rosalie never thought that when she joined Stargate Command that her life would change as much as it did, specially after a particularly rough mission. From forming a new friendship with Major Lorne, to fighting for her life, Rosalie wasn't expecting her life to be turned on its head.
Crossover - Stargate: SG-1 & Stargate: Atlantis - Rated: M - English - Friendship/Hurt/Comfort - Chapters: 18 - Words: 12,121 - Follows: 1 - Published: 9/6 - S. Carter, J. O'Neill, E. Lorne, OC - Complete
Spirit and Legend by Jennifer Schumacher reviews
A heads up from the Brave au sends The Protectors on a new adventure to the Pegasus Galaxy. Along the way, they meet some old friends of the Ancients. Turns out, a name can actually be descriptive.
Crossover - Buffy: The Vampire Slayer & Stargate: Atlantis - Rated: M - English - Adventure/Supernatural - Chapters: 12 - Words: 12,071 - Reviews: 24 - Favs: 15 - Follows: 14 - Updated: 9/2 - Published: 8/31 - Xander H., OC, John S. - Complete
The Child and The Lady by Jennifer Schumacher reviews
Xander, Cordelia and Jesse, now 10, of the Brave au get to visit Atlantis for the summer. Ancient secrets, adventures, oh and you didn't think the Deeper Well and the Hellmouths were the only places the Ancients stashed demons did you?
Crossover - Buffy: The Vampire Slayer & Stargate: Atlantis - Rated: M - English - Adventure/Mystery - Chapters: 17 - Words: 16,307 - Reviews: 25 - Favs: 16 - Follows: 11 - Updated: 8/29 - Published: 8/26 - Xander H., Cordelia C., OC, John S. - Complete
These Violent Delights by Mirrored Illusions reviews
There was someone else in another stasis chamber in one of the unexplored rooms in Atlantis. (AFAD 2023)
Crossover - Buffy: The Vampire Slayer & Stargate: Atlantis - Rated: T - English - Adventure - Chapters: 10 - Words: 15,063 - Reviews: 3 - Favs: 19 - Follows: 41 - Updated: 8/29 - Published: 8/1 - Buffy S., John S. - Complete
Alteran Sorcery by Mystic Sharman reviews
When Voldemort possessed Harry in the ministry atrium. The resulting battle at the centre of the mind. Cursed irreparable damage to Harry's magic. Forcing him to use the remaining dregs of material ability. To build anew and hope that his magic returns in some form. Voldemort's unmarked followers in the ministry managed to banish Harry from the Wizarding World.
Crossover - Harry Potter & Stargate: Atlantis - Rated: M - English - Chapters: 2 - Words: 3,643 - Reviews: 9 - Favs: 58 - Follows: 81 - Updated: 8/9 - Published: 8/3 - [Harry P., OC] [Teyla E., Kanaan]
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