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Harry Potter and the Methods of Rationality
by Less Wrong reviews
Petunia married a biochemist, and Harry grew up reading science and science fiction. Then came the Hogwarts letter, and a world of intriguing new possibilities to exploit. And new friends, like Hermione Granger, and Professor McGonagall, and Professor Quirrell... Ch. 114-116, Shut Up and Do the Impossible.
Harry Potter - Rated: T - English - Drama/Humor - Chapters: 116 - Words: 630,572 - Reviews: 28637 - Favs: 15,504 - Follows: 14,269 - Updated: 17h ago - Published: 2/28/2010 - Hermione G., Tom R. Jr.
Halo: The Ori War
by DX1998 reviews
7 Months Ago...the USS Odyssey vanished without a trace. Seven long months, that saw the Ori march almost unopposed through the Milky Way Galaxy. With none able to stand against them, the armies of Origin were triumphant in all battles. But now...now the Odyssey has returned, and with the aid of the UNSC and Sangheili, they will bring the fight to the Ori.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Adventure/Drama - Chapters: 10 - Words: 41,966 - Reviews: 318 - Favs: 477 - Follows: 611 - Updated: 2/28 - Published: 10/7/2014
by Beastrider9 reviews
All life on Earth had been consumed by Blacklight. With no Biomass to feed on, Blacklight had to evolve, adapt, and grow. Now a collective Council of Aliens discovers the existence of such a life form. How do the aliens see a form of life that is viral, how they deal with it, what are the consequences to the galaxy of such a race existing at all.
Crossover - Mass Effect & Prototype - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 78,421 - Reviews: 802 - Favs: 1,311 - Follows: 1,556 - Updated: 2/28 - Published: 8/8/2014
Vanguard: In at the Deep End
by USSExplorer reviews
The Vanguard finds itself flung into another galaxy that faces the threat of being overrun by a seemingly unstoppable force. With a massively damaged ship, and little time; can the Vanguard make a difference in determining the fate of a galaxy?
Crossover - StarTrek: Other & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 46 - Words: 215,593 - Reviews: 297 - Favs: 234 - Follows: 316 - Updated: 2/3 - Published: 4/26/2012 - Shepard (F)
Oskar Osäker: True Omnivore
by Legionary reviews
Not all of Alex Mercer's "Evolved" were loyal psychopaths. Some were simply desperate people who Alex thought he could easilly control once he infected them with the "Mercer Virus". Now one of these Evolved, one obsessed with security, finds himself in Equestria. Can this Viral being find peace when his own nature will not allow him to?
Crossover - My Little Pony & Prototype - Rated: T - English - Adventure - Chapters: 17 - Words: 232,058 - Reviews: 156 - Favs: 161 - Follows: 152 - Updated: 6/6/2014 - Published: 2/4/2013 - Complete
Mass Effect: Clash of Civilizations
by Eterna1Soldier reviews
In 2157 a Citadel Council exploratory vessel is tasked with opening a dormant Relay into unknown regions of the galaxy. What they find is something they never expected. What happens when two civilizations centered around different technologies clash?
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Mystery - Chapters: 20 - Words: 91,150 - Reviews: 2893 - Favs: 3,203 - Follows: 3,679 - Updated: 4/10/2014 - Published: 10/13/2011 - Tali'Zorah
Halo: The Human Effect
by MJOLNIR117 reviews
Following the Human-Covenant War, Humanity finds a buried device that allows trans-galactic travel far faster than Slipspace. It was heralded as the greatest scientific find in Human history; the rest of the galaxy simply calls it the Mass Effect. Now mankind needs to forge a new place for itself among the stars.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 20 - Words: 67,131 - Reviews: 423 - Favs: 560 - Follows: 674 - Updated: 3/27/2014 - Published: 7/12/2010
A Long Way From Home
by Darth Malleus reviews
A fleet of Alliance ships find themselves in the centre of a hornets' nest. Lost and alone in the middle of hostile territory with nowhere to turn will they survive or perish?
Crossover - Star Wars & Warhammer - Rated: T - English - Sci-Fi/Drama - Chapters: 27 - Words: 165,367 - Reviews: 783 - Favs: 374 - Follows: 335 - Updated: 8/20/2013 - Published: 9/16/2010
by aaron vig reviews
Shepard had seen that the Reapers were coming, then the Heretics and the mercenary armies now sent to stop her. But she never could have predicted the other-world power and opportunity she'd be given... by Cortana and the Master Chief. Mass Effect/Halo
Crossover - Halo & Mass Effect - Rated: M - English - Sci-Fi/Adventure - Chapters: 13 - Words: 81,220 - Reviews: 347 - Favs: 578 - Follows: 669 - Updated: 7/16/2013 - Published: 5/5/2010 - Master Chief/John-117, Shepard (F)
by Animus of Masada reviews
An asari exploration vessel discovers Earth in the 2030's...and the first contact scenario has incredible implications for both species. What does humanity look like through alien eyes? Where do they go from here? /-AU: no Reapers, completely disconnected from the plot of the games, but mostly faithful to the setting. Told from many points of view.
Mass Effect - Rated: T - English - Sci-Fi - Chapters: 16 - Words: 51,333 - Reviews: 1180 - Favs: 1,992 - Follows: 2,129 - Updated: 4/10/2013 - Published: 8/12/2011
Shadows of the Citadel
by Twilights Herald reviews
In 2148, the Ares Macrotechnology colony on Mars discovered a cache of alien technology, proving that life did indeed exist beyond the confines of the solar system. In 2157, that life began to wonder if they were nuts. In 2183, they decided they were. (ORPHANED - PM me if you want to discuss picking it up.)
Crossover - Shadowrun & Mass Effect - Rated: M - English - Adventure/Humor - Chapters: 4 - Words: 53,771 - Reviews: 36 - Favs: 143 - Follows: 161 - Updated: 1/19/2013 - Published: 2/20/2012
Exodus of Stars
by keiranhalcyon2010 reviews
Aleksandr Kerensky has led the war weary Star League Defense Force on a two year long journey into exile. A chance decision leads to a long awaited discovery, and final proof that humanity is not alone in the cosmos.
Crossover - Mechwarrior/Battletech & Mass Effect - Rated: M - English - Adventure/Sci-Fi - Chapters: 12 - Words: 73,164 - Reviews: 236 - Favs: 618 - Follows: 608 - Updated: 12/5/2012 - Published: 7/4/2011
Forward Unto Atlantis
by LucyFearsTheMorningStar reviews
On the way back to Atlantis, the USS Daedalus stumbles upon a wrecked Frigate floating in the void of space between the Pegasus Galaxy and the Milky Way. Will a weary expedition find unexpected salvation? Or will they add to the monument of Ancient sins?
Crossover - Halo & Stargate: Atlantis - Rated: M - English - Sci-Fi/Romance - Chapters: 6 - Words: 18,081 - Reviews: 296 - Favs: 358 - Follows: 471 - Updated: 9/5/2012 - Published: 1/4/2010
by Toasterman reviews
It is the 41st millennium. The Imperium of Man is besieged on all sides by aliens, heretics and mutants. Mankind faces extinction. Its people pray for salvation. Heeding the call, the Emperor has sent...well, the best he could get on such short notice. Now ready for a ball-busting, chaos-purging second half!
Crossover - StarCraft & Warhammer - Rated: T - English - Adventure/Humor - Chapters: 58 - Words: 248,867 - Reviews: 772 - Favs: 333 - Follows: 323 - Updated: 7/22/2012 - Published: 11/22/2009
Mass Effect: Iron Rebirth
by Mashadar reviews
Killed in action, Shepard is deemed lost to all save those who run Project Lazarus. But when betrayal strikes well before the Project is near completion, only one option is left to save him. An experimental brain to machine transplant. The Iron Rebirth.
Mass Effect - Rated: T - English - Sci-Fi/Drama - Chapters: 12 - Words: 140,180 - Reviews: 186 - Favs: 374 - Follows: 346 - Updated: 7/14/2012 - Published: 4/15/2010 - Shepard (M)
by Robert Falcon reviews
A young quarian takes her first steps along her rite of passage into adulthood, knowing neither how important a path she would find herself walking nor whom she might meet along the way.
Mass Effect - Rated: T - English - Adventure/Friendship - Chapters: 20 - Words: 73,794 - Reviews: 63 - Favs: 58 - Follows: 64 - Updated: 6/6/2012 - Published: 3/6/2010 - Tali'Zorah
by DreadCraft reviews
Instead of the Animorphs being kids, those same five people stumble onto Elfangor's wreckage as more mature people in mind and body. As such, they win and survive much more whole then in canon. Now the story refocuses on the possibilities they enabled.
Animorphs - Rated: M - English - Drama/Sci-Fi - Chapters: 14 - Words: 24,378 - Reviews: 5 - Favs: 7 - Follows: 10 - Updated: 2/14/2012 - Published: 11/5/2011 - Jake
by Commander Copyright reviews
The Normandy is destroyed in a surprise attack, and Commander John Shepard killed. But this wasn't what went wrong. In a horrific turn of events, the Commander's body is recovered by the wrong party. As a consequence, everything changes.
Mass Effect - Rated: T - English - Drama/Adventure - Chapters: 11 - Words: 18,289 - Reviews: 170 - Favs: 327 - Follows: 373 - Updated: 2/10/2012 - Published: 6/25/2011 - Shepard (M)
The Zeppo Effect : A BTVS Mass Effect Tale
by Dr Gonzo reviews
A series of one-shots and vignettes about our favorite White Knight's quest to show the galaxy's newest hero how battling extinction level apocalypse is done with style.
Crossover - Buffy: The Vampire Slayer & Mass Effect - Rated: T - English - Sci-Fi/Fantasy - Chapters: 32 - Words: 96,930 - Reviews: 125 - Favs: 264 - Follows: 147 - Updated: 1/8/2012 - Published: 9/7/2011 - Xander H., Shepard (F) - Complete
by puiwaihin reviews
SG-1 find themselves suddenly stranded on an alien world where magic and monsters are real, gods grant powers, and a strange shadow is spreading. As they try to find their way home they will be caught up in an epic quest that will challenge their beliefs
Crossover - Stargate: SG-1 & Dungeons and Dragons - Rated: T - English - Fantasy/Sci-Fi - Chapters: 38 - Words: 149,795 - Reviews: 122 - Favs: 113 - Follows: 74 - Updated: 12/30/2011 - Published: 10/12/2010 - D. Jackson - Complete
Negative Halo 3
by CaptainRaspberry reviews
Across the expanse of space the Covenant Civil War rages, but as the Separatists and Loyalists clash, several warriors will make the ultimate sacrifice for the future of the entire galaxy. The eyes of the Covenant will close forever...
Halo - Rated: M - English - Sci-Fi/Adventure - Chapters: 16 - Words: 107,596 - Reviews: 59 - Favs: 40 - Follows: 41 - Updated: 11/11/2011 - Published: 1/5/2009 - Complete
Into the Black, Forever Free
by Akoro88 reviews
Mal and the crew make an interesting find while on an illegal salvage. A squad of ODST's gets stuck in a slip stream portal from the Ark while on a mission looking for the Chief. When they drop from slip space, whats waiting will test them to the limit.
Crossover - Halo & Firefly - Rated: T - English - Adventure/Friendship - Chapters: 11 - Words: 79,936 - Reviews: 275 - Favs: 342 - Follows: 383 - Updated: 11/9/2011 - Published: 8/27/2009 - Master Chief/John-117, Mal
by Outreach117 reviews
So just why did Clan Wolverine rebel in the early days of the Clans? What really pushed them to nuke an entire genetic repository, and why have they not been heard from since? How would a SPARTAN like John-117 integrate into the Clan Warrior Caste?
Crossover - Mechwarrior/Battletech & Halo - Rated: T - English - Chapters: 20 - Words: 40,495 - Reviews: 74 - Favs: 99 - Follows: 107 - Updated: 10/12/2011 - Published: 11/4/2009 - Master Chief/John-117
Pieces of Eden
by Lang Noi reviews
Altair tried to destroy the Piece of Eden at the end of the game. A note for the wise - artifacts of godlike power are rarely defenseless. Now, the master assassin is trapped in Faerun - in a world of conspiracies, magic, and gods.
Crossover - Forgotten Realms & Assassin's Creed - Rated: T - English - Fantasy/Adventure - Chapters: 9 - Words: 56,609 - Reviews: 59 - Favs: 62 - Follows: 73 - Updated: 8/30/2011 - Published: 10/28/2009 - Altaïr
Mass Effect: A new past
by Bombsquad reviews
A different history to Mass Effect in which Human technology develops along different lines than anything the Citadel knows...an Alternative History of Mass Effect.
Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 137,294 - Reviews: 619 - Favs: 1,110 - Follows: 579 - Updated: 5/18/2011 - Published: 12/11/2010 - Complete
Mass Effect: Nanovictory
by Caesarus reviews
Taking place in an Crysis AU, where Prophet tried to take on the Ceph Lithoship on his own, without the "Tunguska Iteration" upgrade Hargreave possessed.
Crossover - Mass Effect & Crysis - Rated: M - English - Adventure - Chapters: 4 - Words: 22,606 - Reviews: 51 - Favs: 86 - Follows: 104 - Updated: 5/14/2011 - Published: 4/17/2011
Consequences of War
by Lord Hierarch reviews
Reach has fallen, and humanity is on its death bed. The Pillar of Autumn has fled and is returning to Earth. On Earth, mankind is taking its first step out into the galaxy... through the Stargate.
Crossover - Stargate: SG-1 & Halo - Rated: T - English - Chapters: 16 - Words: 31,924 - Reviews: 220 - Favs: 202 - Follows: 255 - Updated: 5/12/2011 - Published: 8/3/2010
Red In Tooth And Claw
by JA Baker reviews
When the crew of Galactica encounters the remains of the Forward Unto Dawn, life starts to get a lot more complicated for all involved, including an old enemy...
Crossover - Halo & Battlestar Galactica: 2003 - Rated: T - English - Sci-Fi/Adventure - Chapters: 60 - Words: 139,295 - Reviews: 1511 - Favs: 952 - Follows: 766 - Updated: 3/13/2011 - Published: 2/12/2008 - [Master Chief/John-117, Cortana] - Complete
Master and Apprentice
by Tyrant of the East reviews
The common man is like a worm in the gut of a corpse, trapped inside a prison of cold flesh, helpless and uncaring, unaware even of the inevitability of its own doom... But some... Some have the ability to see beyond this prison. All they need is guidance
Crossover - Harry Potter & Warhammer - Rated: T - English - Sci-Fi/Fantasy - Chapters: 2 - Words: 6,213 - Reviews: 54 - Favs: 153 - Follows: 177 - Updated: 2/5/2011 - Published: 2/1/2011 - Harry P.
The Spartan and the Spectre
by J.B. Writer reviews
After the fall of Reach, Noble 6 like a ghost finds himself in another reality, waging another battle for a different cause. Shepard and co attempt to thwart the Reapers with his help. Sovereign has other plans...
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Sci-Fi - Chapters: 8 - Words: 49,914 - Reviews: 137 - Favs: 172 - Follows: 108 - Updated: 11/4/2010 - Published: 9/28/2010 - SPARTAN-B312/Noble Six - Complete
by P.H. Wise reviews
The galaxy can be a dangerous place for a homeless civilization - especially a galaxy in the wake of the Jaffa Rebellion. Yet even homeless, even lost amongst the stars as they are, the children of Kobol search desperately for a home... called 'Earth.'
Crossover - Stargate: SG-1 & Battlestar Galactica: 2003 - Rated: T - English - Drama/Sci-Fi - Chapters: 5 - Words: 37,630 - Reviews: 89 - Favs: 131 - Follows: 201 - Updated: 9/20/2010 - Published: 6/29/2010
Halo: The Incursion
by Gobbles the Turkey reviews
With the UNSC-Covenant war over the ruined remains of the UNSC face war with an unknown enemy. Their best hope in adverting a war is sending an advanced stealth warship, the first and only of its kind. The Incursion has begun.
Crossover - Halo & Mass Effect - Rated: T - English - Adventure/Mystery - Chapters: 5 - Words: 40,349 - Reviews: 102 - Favs: 123 - Follows: 159 - Updated: 9/6/2010 - Published: 7/23/2010 - Shepard (F)
by nevertalk reviews
The Collector threat is over. Shepard just wants to gather armies for the Reapers and foster his new relationship but everyone in the galaxy wants something. Many times, what people want is something they had once already. All characters. M for language.
Mass Effect - Rated: M - English - Sci-Fi - Chapters: 40 - Words: 144,576 - Reviews: 234 - Favs: 322 - Follows: 176 - Updated: 8/23/2010 - Published: 4/7/2010 - Shepard (M), Tali'Zorah - Complete
The Whole of the Moon
by Speaker-to-Customers reviews
A side story to 'Tabula Avatar' taking place during chapters 64-67. The goddess Shar seeks to end old conflicts as she prepares for war against Lolth. Her attempt to negotiate a truce with her sister Selûne goes horribly wrong...
Crossover - Buffy: The Vampire Slayer & Baldur's Gate - Rated: T - English - Fantasy/Drama - Chapters: 3 - Words: 10,998 - Reviews: 5 - Favs: 9 - Follows: 6 - Updated: 7/22/2010 - Published: 6/29/2010 - Complete
Closer to Home
by Cyclone reviews
In 2024, the Armies of the Southern Cross discover an extra-terrestrial threat that's a little closer to home.
Crossover - Stargate: SG-1 & Robotech/Macross - Rated: T - English - Sci-Fi/Adventure - Chapters: 10 - Words: 28,030 - Reviews: 105 - Favs: 136 - Follows: 146 - Updated: 3/31/2010 - Published: 1/29/2009
The Master Chief Effect
by BrendanMS reviews
Just Imagine the Master Chief in the Mass Effect universe, that pretty much explains it.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 5 - Words: 14,976 - Reviews: 120 - Favs: 177 - Follows: 237 - Updated: 3/31/2010 - Published: 8/5/2009 - Master Chief/John-117, Shepard (F)
Time to Go
by CreepyReaper reviews
The UNSC is facing a war on its doorstep with an unknown enemy.
Crossover - Halo & Battlestar Galactica: 2003 - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 23,430 - Reviews: 86 - Favs: 51 - Follows: 81 - Updated: 3/13/2010 - Published: 9/21/2009
by Hawki reviews
Poem: Earth would always be the home of humanity. And while Earth's true children broke free from their cradle to explore the stars, they, unlike the ARM, would always remember their origins.
Section 8 - Rated: K - English - Poetry/Sci-Fi - Chapters: 1 - Words: 135 - Reviews: 1 - Favs: 4 - Follows: 1 - Published: 2/12/2010 - Complete
But somehow a most melancholy
by Hotpoint reviews
Spin-off story set in the universe of Hunted Tribes: DISCONTINUED but the story lives on within Hunted Tribes
Crossover - Mechwarrior/Battletech & Battlestar Galactica: 2003 - Rated: T - English - Adventure - Chapters: 32 - Words: 102,693 - Reviews: 187 - Favs: 152 - Follows: 141 - Updated: 10/28/2009 - Published: 9/27/2009
by Sarge Tomzilla reviews
The Ninth Age of Reclamation is over. The Covenant, along with its member state of the Alliance serving Humanity, have become a part of Citadel space. A special operations soldier, Shepard, will find herself thrust forward into an epic race against time.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 2 - Words: 5,420 - Reviews: 14 - Favs: 42 - Follows: 40 - Updated: 8/23/2009 - Published: 5/30/2009
March to Victory
by Trinial reviews
The war is over, but the Spartans don't know that. Desperate to find a way back into the fight, they inadvertantly stumble across ancient devices, and an alliance so old that no one remembered it ever existed.
Crossover - Halo & Stargate: Atlantis - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 30,430 - Reviews: 142 - Favs: 255 - Follows: 325 - Updated: 7/8/2009 - Published: 5/1/2008
by Anubis1 reviews
Halloween crossover. Xander dresses up as the Master Chief from Halo and gets in all sorts of trouble. Xander Faith pairing in later chapters. BTVS, Jurassic Park, Halo & SG1 crossover eventually.
Crossover - Buffy: The Vampire Slayer & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 17 - Words: 111,964 - Reviews: 235 - Favs: 349 - Follows: 340 - Updated: 8/13/2007 - Published: 12/10/2005 - Xander H.
Sort: Category . Published . Updated . Title . Words . Chapters . Reviews . Status .
Mass Effect: The Reclaimers reviews
During the battle for Earth, a few UNSC soldiers make contact with a group of aliens, with their new allies they try to do all they can to save their species. Meanwhile, one of the remaining inner colonies, Shanxi, goes dark.
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi - Chapters: 13 - Words: 63,524 - Reviews: 190 - Favs: 335 - Follows: 397 - Updated: 6/9/2011 - Published: 8/13/2010 - Shepard (F)
Spirit of Fire: To save humanity reviews
A crossover, Spirit of Fire and John Sheppard from mass effect. The spirit has escaped the shield world, but now they have no idea where they are, or where to go, until they come into contact with other humans who have never heard of the covenant or UNSC
Crossover - Halo & Mass Effect - Rated: T - English - Sci-Fi/Adventure - Chapters: 15 - Words: 46,880 - Reviews: 169 - Favs: 322 - Follows: 353 - Updated: 8/17/2010 - Published: 8/13/2009
Robotech: The Liberators reviews
AU, Instead of the Haydonites, the yeerks attack Space Station Liberty. The REF finds itself in another war all too soon, will their depleted fleet be able to turn the tide and save the galaxy?
Crossover - Animorphs & Robotech/Macross - Rated: T - English - Sci-Fi - Chapters: 4 - Words: 13,533 - Reviews: 6 - Favs: 14 - Follows: 13 - Updated: 12/18/2009 - Published: 11/22/2009 - Elfangor, Vince