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Detour by Kristen Sharpe
They landed in the middle of a warzone. Which meant Dr. Cosmo's horribly constructed teleporter actually worked. Flug was professionally offended and personally pleased. The question now was - where were they?
Crossover - Girl Genius & Villainous - Rated: K+ - English - Humor - Chapters: 1 - Words: 1,133 - Published: 5/10 - Dementia, Dr. Flug, 5.0.5 - Complete
Brockton's Celestial Forge AU – Europa's Celestial Forge by Lord Roustabout reviews
An alternate version of events that diverts from chapter 3 of Brockton's Celestial Forge. A connection to the world of Girl Genius sends Joe from Brockton Bay to Europa before the events of the Agatha Heterodyne and The Beetleburg Clank. Joe struggles to adjust to the new world while still managing his rapidly growing power. Updates will be less frequent than for the main work.
Crossover - Girl Genius & Worm - Rated: T - English - Chapters: 1 - Words: 9,679 - Reviews: 21 - Favs: 181 - Follows: 204 - Published: 5/2
Mad Scientist Xander by Balder reviews
Another Halloween story with different costumes for some.
Crossover - Buffy: The Vampire Slayer & Girl Genius - Rated: T - English - Chapters: 1 - Words: 3,282 - Reviews: 1 - Favs: 25 - Follows: 25 - Published: 7/22/2022 - Xander H., Cordelia C., Tarvek S. - Complete
Alexander Von Dyne by Tjin reviews
During the Episode 'The Pack' Alexander is attacked by a vampire, dying and currently possessed by two separate spirits the banishing spell sent him far, far away.
Crossover - Buffy: The Vampire Slayer & Girl Genius - Rated: T - English - Chapters: 6 - Words: 16,218 - Reviews: 28 - Favs: 137 - Follows: 162 - Updated: 4/14/2022 - Published: 9/18/2018
The Frontier Spark by dmandog056 reviews
As the precursor artifact gold rush erupts across space, young militia titan pilot lieutenant Thomas Burke finds himself on a dimension hopping adventure of epic proportions. How will the battle tested future soldier adapt to a world of steampunk style, and how will Agatha Heterodyne adjust to a high tech future of acrobatic revolutionary heroes and mighty mechs?
Crossover - Girl Genius & Titanfall - Rated: T - English - Sci-Fi/Fantasy - Chapters: 12 - Words: 34,878 - Reviews: 22 - Favs: 34 - Follows: 50 - Updated: 4/8/2021 - Published: 5/24/2018
Honorary Jaeger by ktwontwo reviews
Look vot got injured helpink mit de rempage! Can ve keep it? (Part 3 of "A Goose Walked Into a Fandom.")
Crossover - Girl Genius & Untitled Goose Game - Rated: K+ - English - Humor - Chapters: 1 - Words: 378 - Reviews: 1 - Favs: 2 - Follows: 2 - Published: 2/19/2021 - Goose - Complete
Louise Valliere and the Madboy by Empirialtank reviews
Louise Valliere wanted a familiar that would impress everyone. What she got was a crazy young man obsessed with something called science, and unfortunately for her this is no ordinary science, this is Mad Science! He might be just the help she needs to master her explosive magic, but he also might be just a little bit evil. Rated T for graphic violence and German swearing.
Crossover - Familiar of Zero & Girl Genius - Rated: T - English - Adventure/Humor - Chapters: 4 - Words: 54,907 - Reviews: 89 - Favs: 266 - Follows: 303 - Updated: 9/11/2020 - Published: 2/8/2015
Ladybug Genius by Ragman Jack
When Chloe accuses her of stealing her bracelet, Marinette has her Spark breakthrough and in Paris, being a Spark carries its own obligations. But when an assassination attempt on a visiting dignitary threatens war, it's up to Ladybug and Chat Noir to save the day. Even if that means going to Castle Heterodyne itself.
Crossover - Girl Genius & Miraculous: Tales of Ladybug & Cat Noir - Rated: T - English - Adventure - Chapters: 1 - Words: 4,170 - Favs: 13 - Follows: 14 - Published: 8/16/2019
A Time for War by San Antonio Rose reviews
From Cold Oak to Sunrise, Phase 3 of the Stanford Adventure Club's plan to save Sam Winchester leads through ghost towns and demon fire to the very gates of Hell. But despite their triumphs, Zantabraxus warns that the war's not over yet, and soon the club has a new and deadlier mission - with John Winchester's life in the balance. (AU, gen with background het)
Crossover - Supernatural & Girl Genius - Rated: T - English - Adventure/Family - Chapters: 7 - Words: 35,902 - Reviews: 1 - Favs: 3 - Follows: 1 - Updated: 10/19/2018 - Published: 10/14/2018 - Complete
A Time to Gain by San Antonio Rose
Phase 2 of the Stanford Adventure Club's plan to save Sam Winchester hits a snag when a vision sends the Winchesters to Lawrence, and Lucrezia Mongfish finds John Winchester before his sons can. But the elder generation may have enough tricks up its collective sleeve to turn Hell's schemes inside out. (AU, het; warning for Lucrezia being horrible)
Crossover - Supernatural & Girl Genius - Rated: T - English - Adventure/Family - Chapters: 6 - Words: 30,201 - Favs: 3 - Follows: 1 - Updated: 9/5/2018 - Published: 8/31/2018 - Complete
Spark The Beacon by Grub Leaf-Eater reviews
What if Summer was actually a uneducated Spark from Europa, and Ruby inherited it from her? Possible future Nuts&Dolts.
Crossover - Girl Genius & RWBY - Rated: T - English - Chapters: 9 - Words: 12,365 - Reviews: 37 - Favs: 178 - Follows: 208 - Updated: 5/18/2018 - Published: 6/29/2017 - Othar T., Ruby R., Yang X.L.
Girl Genius' Animagus by Quatermass reviews
(Based on whitetigerwolf's 'Animagus Lover' challenge! Bashing!) Agatha Clay found an injured owl one day, and nursed him back to health. Two years later, on the day her story truly began, he revealed himself to be a wizard from another world...and he has vowed to protect her. But between Sparks, politics, dictators, and assassins from another world, will they survive?
Crossover - Harry Potter & Girl Genius - Rated: M - English - Fantasy/Adventure - Chapters: 19 - Words: 55,168 - Reviews: 152 - Favs: 568 - Follows: 544 - Updated: 5/17/2018 - Published: 9/29/2017 - [Harry P., Agatha H.] Klaus Wulfenbach/Baron, L. Mongfish - Complete
Agatha Emiya and the Fifth Holy Grail War by Satire Swift reviews
Agatha Emiya was looking forward to ending her last year in high school and going off to college to earn those degrees in Physics and Engineering. However, all is not well in the city of Fuyuki, and for the girl with the wondrous and mystifying inventions, this means trouble. There's some kind of secret war starting among shady individuals using... magic? How unscientific.
Crossover - Fate/stay night & Girl Genius - Rated: M - English - Supernatural/Fantasy - Chapters: 12 - Words: 71,356 - Reviews: 360 - Favs: 880 - Follows: 974 - Updated: 4/29/2018 - Published: 3/10/2013 - Saber, Agatha H.
Prometheus by ExplosiveDevastation reviews
All tinkers have voices in their heads, telling then to take over the world and show them all, right? Big thanks to my betas for helping me in this.
Crossover - Girl Genius & Worm - Rated: M - English - Sci-Fi - Chapters: 11 - Words: 41,877 - Reviews: 131 - Favs: 639 - Follows: 669 - Updated: 4/12/2018 - Published: 12/20/2016
A Time to Seek by San Antonio Rose reviews
Phase 1 of the Stanford Adventure Club's plan to save Sam Winchester involves locking the British Men of Letters out of the bunker and capturing Cuthbert Sinclair's hidden mansion. But with unexpected reunions and stunning revelations waiting for them, the Winchesters may find far more than they thought they were looking for. (AU, gen w/background het)
Crossover - Supernatural & Girl Genius - Rated: T - English - Adventure/Family - Chapters: 6 - Words: 30,703 - Reviews: 6 - Favs: 5 - Follows: 5 - Updated: 4/3/2018 - Published: 3/29/2018 - Complete
Unheroic by genericdarklord reviews
A little over 600 years after an extradimensional invasion, humanity has a lot to cope with. The Outsiders are obviously a problem, but so are the superhumans their arrival created. Used as weapons and tools, they can't leave their walled cities without a sponsor. Our heroes aren't actually heroes, nor are they villains. They're just completely irresponsible.
Crossover - X-Men & Girl Genius - Rated: M - English - Humor/Adventure - Chapters: 2 - Words: 16,449 - Reviews: 1 - Favs: 4 - Follows: 9 - Updated: 12/2/2017 - Published: 11/12/2017
And the Walls Come A-Tumblin' Down by San Antonio Rose reviews
November 2, 2005: John Winchester is missing, and Jess Moore has a date with Sam Winchester's ceiling. Everything's going according to plan... but Hell's been planning without the Stanford Adventure Club. (AU, gen with background het)
Crossover - Supernatural & Girl Genius - Rated: T - English - Chapters: 5 - Words: 25,090 - Reviews: 7 - Favs: 7 - Follows: 3 - Updated: 9/4/2017 - Published: 8/31/2017 - Complete
Takes to Its Wings like a Hawk by San Antonio Rose reviews
Dean Winchester's not exactly ready to settle down to an apple-pie life, but he does yearn for a steady, stable relationship. Fortunately for him, his broken heart is about to send him on a collision course with a certain green-haired Amazon who might just be everything he never knew he wanted. (Stanford Adventure Club AU)
Crossover - Supernatural & Girl Genius - Rated: T - English - Romance - Chapters: 1 - Words: 2,161 - Reviews: 1 - Favs: 4 - Published: 7/27/2017 - [Dean W., Zeetha] - Complete
Need a Solution to Play by San Antonio Rose reviews
Gil and Agatha Wulfenbach's elopement sets off enough bombshells to load a B-17, exposing many more secrets than just their own. (Sequel to "The Key that Fits a Million Locks," Gil/Agatha; warning for SPN-level weirdness and violence against really skeevy humans)
Crossover - Supernatural & Girl Genius - Rated: T - English - Supernatural/Family - Chapters: 3 - Words: 17,623 - Reviews: 3 - Favs: 8 - Follows: 1 - Updated: 7/26/2017 - Published: 7/24/2017 - [Agatha H., Gilgamesh W.] - Complete
The Key that Fits a Million Locks by San Antonio Rose reviews
In which Gil Wulfenbach elopes with Agatha Clay-and somehow that's the *least* exciting part of their afternoon. (Modern AU, Gil/Agatha, warning for SPN-style weirdness)
Crossover - Supernatural & Girl Genius - Rated: T - English - Romance/Supernatural - Chapters: 1 - Words: 6,311 - Reviews: 2 - Favs: 5 - Published: 7/23/2017 - [Agatha H., Gilgamesh W.] - Complete
The Stanford Adventure Club by San Antonio Rose reviews
When John Winchester forbids his son Dean to go to college, Dean fears he'll lose Gil Wulfenbach's friendship altogether. Gil's determined not to let that happen, though, and Stanford holds old and new acquaintances to join their circle of friends... a bond that will soon be forged in blood. (AU, gen, background Gil/Agatha and Tarvek/Colette; warning for SPN-style violence)
Crossover - Supernatural & Girl Genius - Rated: T - English - Friendship/Hurt/Comfort - Chapters: 3 - Words: 16,314 - Reviews: 3 - Favs: 6 - Follows: 1 - Updated: 7/22/2017 - Published: 7/20/2017 - Dean W., Gilgamesh W. - Complete
Locket and Leave It by San Antonio Rose reviews
Lucrezia Mongfish was a witch. Aaron Sturmvoraus is a drug dealer determined to bring her back. But although Agatha Clay is already suffering from the effects of Lucrezia's cursed locket, Sammy Winchester and Gil Wulfenbach are determined to help her before it's too late... and "oft evil will shall evil mar." (AU, gen, warning for mind control and Lucrezia being horrible)
Crossover - Supernatural & Girl Genius - Rated: T - English - Supernatural/Horror - Chapters: 3 - Words: 12,092 - Reviews: 3 - Favs: 5 - Updated: 7/2/2017 - Published: 6/30/2017 - Complete
Uncle Sam's Misguided Children by San Antonio Rose reviews
A reunion between two former Marines is always an event. But when John Winchester moves in next door to Klaus Wulfenbach, both of them on the run from the consequences of very different post-Vietnam pasts, Klaus is in for some shocking revelations about his old friend - and his own life. (AU, gen, past Klaus/Zantabraxus, Klaus/Lucrezia, Lucrezia/Bill, and John/Mary)
Crossover - Supernatural & Girl Genius - Rated: K+ - English - Supernatural/Friendship - Chapters: 1 - Words: 3,581 - Reviews: 1 - Favs: 3 - Published: 6/25/2017 - Complete
Cry Uncle by San Antonio Rose reviews
Adam and Judy Clay get a surprise visit one dark and stormy night from a distraught Barry Sanders, who comes with a bundle of joy, a tale of woe, and a worrying request for his old friends. (AU, sequel to "Thicker than Water," gen with background Adam/Judy and Bill/Lucrezia)
Crossover - Supernatural & Girl Genius - Rated: K+ - English - Supernatural/Horror - Chapters: 1 - Words: 2,831 - Reviews: 1 - Favs: 4 - Published: 6/24/2017 - Complete
Thicker than Water by San Antonio Rose reviews
Judy Wright doesn't think anything of it when her mother asks her to take some soup to the pneumonia-stricken mother of her best friends. Little does she know that Teodora Sanders has a terrible secret - and is desperate to tell someone before her past finds its way out of Transylvania to kill her. (Modern AU, Saturn/Teodora, warnings for GG-canon and SPN-level violence)
Crossover - Supernatural & Girl Genius - Rated: T - English - Supernatural/Horror - Chapters: 1 - Words: 8,520 - Reviews: 2 - Favs: 7 - Follows: 1 - Published: 6/15/2017 - Complete
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