Alternate History Two Settings that just click. Crossover Edition.


Well-known member
Aug 26, 2019
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Anyone got any suggestions on settings that would be compatible with the insanity of Warhammer 40k? :p
Geneforge? The main faction are human supremacist wizards who grow living technology, magic crystals, and make armies of magic BOWs (Which are commonly in the forms of dinosaurs) who are called the Shapers. The Shapers hold disdain for outsiders and hold an effective monopoly on any market more advanced than basket weaving, have effectively infinite martial manpower, and rule all of the "known" world. You could spin the entire thing as a research colony that suffered terribly from the Dark Age of Technology. Heck the demons (which are powerful endgame enemies), are non-physical entities from another plane of existence that corrupt and consume as many as they can. The one weird thing that might be the most jarring is that some how Shapers from the past millennium before the games take place some how put a existential fear of their Order into every demon, to about half the level of what Sanguinius did to the Beast; the games never tell or show you what was done or even how it was done, only that it happened.

Edit: You could spin the Shapers as mostly stable gamma and delta level psykers who mostly spec into Biomancy and Telepathy.
Edit 2: The Shapers are hilariously enough militaristic environmentalist Hippies, who took over the world to stop people from using their research to create things that nearly wiped out humanity on that world several times over. Considering the second game, They consider purifying and terraforming a corrupted/cursed mountain range into a bountiful oasis lush with life and safe for human habitation and comfort to be a decade long project, with standardized procedures to do so.
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The Dog Whistler... I mean Whisperer
Aug 13, 2019
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The Drakwald
Gears of War and Seras always had a Warhammer 40K feel and with their Gothic and Latin inspirations as well as the whole aesthetic it would be completely UNSURPRISING if Seras was just some lost colony of Humanity somewhere that had been chugging along for the past couple millenia since Emperor knows when.

Hlaalu Agent

Nerevar going to let you down
Aug 11, 2019
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Rethan Manor
Metro and Silent Hills. Just think about how those settings blend the natural and supernatural and even the themes of redemption, guilt, etc...

I mean in Metro you have what might literally be the busted gates of heaven killing people. Or what about the in-universe musings that some of the monsters might not actually be mutants, but ancient creatures that have always been there hiding, but now mankind is weakened they are emerging and coming in for the kill.
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Well-known member
Jun 14, 2020
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I've always thought XCOM and Starcraft were surprisingly compatible, with the events of Starcraft occurring far in the future of XCOM


In Captain America We Trust.
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Aug 9, 2019
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Stargate/Farscape: Had an idea that Stargate Command quietly funded John Chrictons mission and to test a new hyper rocket of their creation. A proto rocket of what would later be the rocket used on the 302 Fighters.

The Galaxy is a big place and Peacekeeper, Scarren, Nebari and the Uncharted Territories are in a region that the Goa'uld got kicked out of many thousands of years ago and haven't been back since. Completely plausible within the frame of each setting.


May 20, 2020
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so are we talking about Crossovers only or can we talk about Fusing two different Franchises into one. because i could list several Fanfictions that are like that.


In Captain America We Trust.
Staff Member
Aug 9, 2019
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so are we talking about Crossovers only or can we talk about Fusing two different Franchises into one. because i could list several Fanfictions that are like that.


Oct 30, 2019
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Very rough version :

When Crictron goes back to Earth to seal the wormhole (in season 4 IIRC) its takes him back to Sol but in post season 4 Babylon 5.

The module with him Aeryn and pilot is quickly detained by Earthforce.
The Skarren Stryker that was following him comes through also. They naturally refuses to be detained and goes out in a blaze of glory unable to make it back to the wormhole.

EA verify who Chrichton is from old records and telepaths. Knowing what they do they and having a beachead almost directly aroind Earth from 2 very large and possibly very hostile empires they are forced to secure the other side of the wormhole.

Ivanova leads the taskforce from the EAS Titan (cos we never see enough Warlocks) and it butterflies from there.


May 20, 2020
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Cool, Here some Fanfiction Stories that are either Crossover fanfictions and Fusions.

Tom Clancy EndWar X Mass Effect
Dawn of Titans Universe by F13D (
Dawn of Titans Chapter 1 - Prologue, a Mass Effect + EndWar Crossover fanfic | FanFiction
Summary:There is nothing fair, just, or honorable about war. There is only winning and losing, the living and the dead. Humanity has learned this truth and has ascended to the stars. What effect will this have on the rest of the galaxy, one that has experienced millennia of peace? Will it be able to maintain the peace or will it be ushered into a new age of war? Let the end begin. A/U
Chronicles of a New Age (Codex) Chapter 1 - Timeline, a Mass Effect + EndWar Crossover fanfic | FanFiction(Dawn of Titan Codex)
Summary: A few of us decided to band together and pool our collective abilities to create a new Mass Effect x Endwar crossover story. F13D, Andotrota and V-rcingetorix are proud to present our new work: Chronicles of a New Age (Codex). Here you will find all the necessary lore to the trilogy. The first part of the trilogy: Dawn of Titans has been published.

Rise of Giants by Micelzod
Mass effect rise of the giants Chapter 1, a Mass Effect + EndWar Crossover fanfic | FanFiction
Summary:The systems Alliance has lied to the US, European Federation and Russia that there is life out in space hoping to give the Citadel Council a good impression but when a colonization fleet encounters a already colonized planet then the secrets out in a giant way.

Tom Clancy EndWar/Call of Duty Infinite Warfare/Star Wars The Clone Wars

endwar the clone wars Chapter 1, an EndWar + Star Wars: The Clone Wars Crossover fanfic | FanFiction By Micelzod
war a bloody,brutal,merciless,word it brings out the great in us or the worse in us. the clone wars rages across the galaxy with no ending in site but when a failed rescue attempt resulting an crash landing making the survivors meet a people who now's war all to well, how will the galaxy react to this newcomers.

Alien Vs Predator X Mass Effect(Mass Effect X Predator/ME X Aliens)

(Jerseydanielgibson Mass Effect vs Aliens Series)
Mass Effect vs Aliens: The Siege Of Hadley's Hope
Summary: LV426, a Weyland-Yutani Corp. Colony out in the Reticuli System. A colonial distress beacon has been triggered with no return reply, and the Alliance has sent recent graduate 2nd Lieutenant Jane Shepard and squad of Marines to investigate, along with the survivor of the WYC Nostromo, Lt. Ellen Ripley… (F!ShepxBurke)

Mass Effect Vs Aliens 2: Valkyrie Rising
Summary: Humanity's First Specter, 1LT Jane Shepard, has received a disturbing message from somewhere out in the Attican Traverse; a terra-fracking mining ship has found a strange device on a planet… and the ship has now gone silent from a strange biocontaminate. Can Agent Shepard and her team of humans and aliens discover the fate of the Ishimura without joining it? (F!ShepxVasir)

( magkiln AVP X Mass Effect Fanfic Universe/Slight with Starship Troopers)
Someone has heard them scream
Summary: A council ship on a routine survey mission comes across a derelict vessel of unknown origin. Upon boarding, they find a single body, curiously asari-like, with its chest burst open as if from the inside. When the ship's owners arrive, first contact has to be made under the worst possible circumstances. (Rated T for violence and some horror)

Someone had blundered
Summary:A turian scout force sets out to patrol empty starsystems. A human exploration fleet makes ready to approach a dormant mass relay. Soon their paths will cross and if they fail to make peaceful contact, the consequences will be deadly. Rated T for violence

Summary:It has been sixth months since the Skyllian Blitz and the galaxy has started to move on. But although their rhetoric has lost its edge, the United Systems are not prepared to let this insult pass. Twenty years ago, they taught the galaxy a lesson. Now it seems that some people need a refresher course

Summary:The Citadel Council doesn't want another conflict. Their reputation rests on their ability to maintain the peace. The Alliance of United Systems doesn't want another conflict. They won the last one, no need to risk spoiling their record. Shepard doesn't want another conflict. The last one was ugly enough. Unfortunately, it seems that some people didn't get the memo.

Summary:A collection of in-universe reports regarding technical details for the story: Someone has heard them scream and sequels.

(SomeGuyOverHere Mass Effect X AVP Universe)


Summary:The Hunt is on again. But this time, the hunters will not just be hunting the most dangerous people on earth. They'll be hunting the most dangerous people in the entire universe. Including Thane Krios and Urdnot Wrex.

Aliens: Bane of the Reapers
Summary: The War with the Reapers has ended and in the few years that has passed since Shepard activated the Crucible ,the team that helped her, has split up to help their peoples in the effort. Ashley Williams, now a Spectre, is called on a mission, given a team, and sent to the Mars to fight a remnant of Cerberus. But Cerberus's greed has released a force even the Reapers once feared

AVP: Omega
Summary:2 years after the Reaper War, Cerberus still retains control over Omega and Aria T'loak wants it back. To reclaim her station she recruits Commander Jane Shepard, together they will take back Omega and destroy Cerberus once and for all. But they will soon learn that Cerberus isn't the worst enemy in Omega. The sequel to Predators: Variety of Prey and Aliens: Bane of the Reapers!

AVP X Terminator

The-last-Connor by Captain Tazer
Summary: Three Terminators arrive in the year 2180 with the intent to terminate a selected group of people. One of the targets is a little girl named Newt. Can a certain Terminator from the past keep her safe? This is an AU crossover story: Aliens with Terminator Genisys - the events of Alien3 did not happen in this timeline. Rated "T" for bad language, child-abuse and a lot of deaths

Command and Conquer Tiberium Saga X Mass Effect Universe (Peptuck and Charnobyl)

Eagle's Fall By: CharNobyl
Summary: Shanxi becomes the first human world since Earth to be invaded by hostile aliens. Outnumbered and reeling, the GDI troops dig in for war, hoping their trenches will not become their graves. The First Contact War, with GDI replacing the Systems Alliance.

The Verge War By: CharNobyl
The war between the Batarian Hegemony and the Global Defense Initiative marks the first formal war against a galactic power for humankind, but the Hegemony is a far different force than the pirates it funded. Followup to "Eagle's Fall," in "Renegade" AU

Renegade By: Peptuck
The year: 2183. An attack on the Global Defense Initiative colony of Eden Prime threatens to ignite war between GDI and the Citadel, and only one woman can keep the peace, track down the attackers, and expose the true threat to the galaxy. Alt.Universe

Command and Conquer X Halo

Flight-of-the-Twin-Eagles By: Blazblade
UNSC and GDI. Two different military forces, both made to defend Humanity from forces that would destroy it. Through an anomaly in space, these two would meet in order stop a threat against one humanity as a legend is found by the Initiative. New and old threats soon appear around the two groups as a new alliance is formed. The two eagles take flight into new skies.

Command and Conquer X Gundam Seed
Tiberium: The Fires of Terra by BlueRock
War has just be declared after a terrorist attack wiped out the leaders of the United Nations between the Earth Alliances and PLANT but the first shot has yet to be fired. So what will happen when suddenly another UN organization from another reality arrives unforeseen. Will the ideals of the UN hold true or will there be nothing but war in the future.

Halo? No I have horns
By: Final SD
Hell no longer could Deal with the Doomslayer. He was too much. They also feared killing him as to be trapped with his soul. So they sent him away. A drift in the stars for hundreds of years till eventually he was discovered by Infinity.

The Covenant's Mistake
By: 336
The Covenant fear Demons, and Demons fear Doomguy.

By: ChrisTheEMT
2 Years after Halo 5 Guardians. A simple diplomatic mission goes to hell for Master Chief and Blue Team on Mars City. Can they stop the next threat to Earth? Halo x Doom 3 Crossover.

By: GamerJay
Remnant never knew what true horror was until demons more terrifying than the Grimm arrived, seeking to conquer a world they think belongs to them. Nor the limits a warrior stripped of his humanity would push himself, and others, to exterminate the Slaves of Doom and their mortal allies. His path of perpetual torment continues and this time he will no longer be walking it alone...

By: Kingly Crimson
With the Doomslayer being transported to the Chaos Realms after a scuffle with a revived Cyberdemon, It is now time for everyone to give their condolences. To the Demons of course. Warnings: Rated M for Sexual Themes in some Chapters as well as a lot of Blood and gore. (What did you expect. It's a Doom crossover with Warhammer for crying out loud!)

Kar En Tuk (DOOM Eternal/Warhammer 40K) by Pastah_Farian
With Earth finally safe, it seems that the DOOM Slayer finally has his time to rest. Unfortunately for him, messing with things like cosmic order and other such matters attracts the attention of certain powerful entities. One such entities is very interested in his abilities to change fate.

WarHammer 40k X RWBY

By: vixvix
Sanguinius dies but The Emperor salvages his dead son's soul, or at least as much of it as possible and send it to Remnant. 10.000 years later Jaune Arc is born and he grows up wishing to become a hero. Pity that The Emperor's soul-salvaging plans didn't quite work out. See how the young knight deals with mutations, personal issues, love, duties and old memories of a dead Primarch.

Halo X Mass Effect

A joint Asari-Turian operation salvaged a "package" from a derelict wreckage in the Terminus Systems, whereupon they release a force of war beyond their reckoning. Hoping to avoid another war, Commander Shepard recruits the "package" into her team. A simple act of kindness, unwittingly paving the way for a clash unlike the galaxy has ever seen. Fate directs the flames of war.

To Infinity
By: creamofwheat2311
After discovering an ancient artifact, the UNSC's most advanced warship and a Sangheili Assault Carrier are transported to a universe unlike anything they have ever seen, and forced into a war against a foe they never could have imagined.

By: Gabenator5
While Shepard is closing in on Saren. Stories begin to spread among the pirates and slavers of the galaxy. Rumors of a nameless fear, of a creature, a demon wreathed in green armor. It and its allies appear from nowhere slughtering all who oppose them, then vanish without a trace. What is the purpose of this unknown faction... and what will they do next?

By: Bodacity2.0
A nuke, a slipspace portal, and a human digitizer - the perfect ingredients for the unexpected. Fortunately for Shepard and Co., a little unexpected, or in this case, a BIG unexpected, is just what this galaxy needs. Get ready to finish the fight, laser up, and give some people back their bombs.

By: Twisted Fate MK 2
(Credit to Adrasos on Archive and his story, Prepare to Drop, for the idea.) On the way down to New Mombasa, Rookie falls into the Slipspace Rupture and ends up crashing down on Menae, high above Palaven, while Shepard tries to find and rescue the new Primarch. From there, the war itself will shift and the fighting persists, but who knows what an ODST will add to the mix.

What-The-Future-Brings By: Real Teagy SOT
Only 5 years after the End of the Human-Covenant war does Humanity meet another alien Civilization. but this one has different technology and hasn't heard of the Forerunners. Is this one open to peace at first contact? or will Humanity be bludgeoned by outside forces yet again?

Halo X Star Wars

By: SpaceCowboy2013
When the unknown regions of space is revealed to the galaxy at large by a CIS warship the UNSC becomes members of galactic community, but its existence is soon threatened by the rise of an Empire from the ashes of a declining Republic


By: zzzxxc1
When the Milky Way is revealed to the universe at large by a derelict CIS warship, the UEG are forced to become members of the transgalactic community, but its existence is soon threatened by the decline of the Republic, and the rise of an Empire. Adopted from SpaceCowboy2013.

Star Wars: The Guardians of the Force Chapter 1: Act 1 Part 1, a Star Wars + Halo Crossover fanfic | FanFiction
By: Pinoy Gamer
The Force will not be chained to the wills of an uncaring being – it was not a puppet to be played and discarded when done. If this…this monster wanted wrestle the control of the galaxy, then the Force will give Him the fight He truly wished to have.


By: Grubkiller19
Mankind has been through so much in it's struggle for survival. But the Empire has no regard for Man's problems. Only for its own quest for power and domination. The Empire moves to subjugate the only people that has ever dared to defy them. But they will find that to be a difficult endeavor.

When the Newly formed Terran Union and its allies make contact with the Galactic Republic, it sets off in motion events that would shake up a galaxy that is not so far away

By: MEleeSmasher
Taking place during and after, UH-60 NIGHTSTALKER's HALO: The Terran-Republic Affair. The Terrans appearance in the galaxy changed many lives, and this story aims to tell them how they did so. Multiple story branches, some parts tying in with Spartan Ops.


By: de4deye117
After leaving the Jedi Order, young Ahsoka Tano is now at the end of her useful career. That was until an unlikely ally presents her a second chance at life to help unravel the mystery behind an enigmatic being from beyond the rim

Star Wars X Earth

By: ghost company
Darth Sidious had a plan and a place for everything. However, it is all put at risk when General Grievous's campaign comes crashing into Earth. When the Jedi race to the planet's defense, no one could foresee what would happen next. Will Sidious's plans survive the invasion, or will Earth spell his end? Finally, can Earth survive it's violent introduction to the galactic stage?


By: We'retheDesperateMeasures-ODST
It's 1968 and Earth now knows they aren't alone. After being victorious in 'Nam, the U.S.; and other nations on Earth all unite for the common good to prevent the Sith from conquering the Sol System. Will there be a detente in the Cold War in order to protect Earth? Or will Earth fall due to disagreements? Follow this story from the events just before the Shadow of Revan to KOTET.


By: ozai37
Ahsoka, Alix, Captain Rex, and four Republic Commandos are stranded on a strange, unknown star system. Now, they must try and protect this new planet from Separatist invasion, or watch it go up in flames. Enjoy! A/N: There will be numerous elements from the COD: Modern Warfare series. Rated T for language/violence/war. Not suitable for children, especially in later chapters.

Halo/Stargate SG1

By: Slipspace Anomaly
Nations collide as 2 alternate versions of the Milky Way Galaxy are joined into 1. As members of the SGC and the UNSC struggle to establish peaceful relations, a new threat emerges. One that includes new enemies from each of their pasts

Star Wars X Avengers
By: free man writer
The Clone Wars are in full swing with the galaxy divided. The Jedi lead the clone army against the infinite droid army of the Separatists. Yet a wild card enters the fray. The Avengers. From there, newer, more sinister and deadlier threats emerge and The Galaxy, no, the universe, shall never be the same again

Gears of war X Call of duty
By: The Helghast Marine
Humanity once believed there was life in Outerspace but never expected there was life underground. What if Emergence day happens on Earth instead of Sera? How would the world put up a fight for their survival? Following the Timeline to individual accounts during the global conflict against the Locust Horde. Inspired by Novel World War Z.

Gate X Ghost Recon
Ghost Recon: The Gate
By: Peacekeeper 37
Captain Scott Mitchell of the Ghost Recon Special Forces group has seen more than his fair share of war. But NO ONE could have seen this coming. A simple black ops mission in Japan to assassinate a Yakuza with plans for a dirty bomb after a few years of relative peace leads to a conflict with might and magic from a 'Gate.' A new chapter for Ghost Recon has been opened.

World in Conflict X Mass Effect
Space in Conflict: Human Assault
By: Phuripat
Relay 314 is activated and the Turian find Earth in the middle of WW3, the Turian thought they can defeat Earth within a week but they soon found out that they are messing with someone they shouldn't be messing with. Co-Author with Timedraven117. Warning, HFY. Viewers discretion is advised
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I love it when a plan comes together.
Jun 8, 2020
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Seriously I know it sounds crazy but here me out.

I thought to make it that Eru made the world of Remnant to a point and the Brother's were created to watch over it (without them being aware of it) until he was ready to build life there or until the brothers did something themselves as Eru had given them a bit of his will and the flame imperishable so they could create things of their own as a experiment on Eru's part.

Long story short the Brothers created humanity as his proxy as he intended, but then they completely start acting out of line and rebelling against his will, delving into extremes and well....

Salem being treated so inhumanly bad and being denied the gift of man was one straw and them destroying humanity was the one that broke finally the camels back.

So to rectify this he looks to the world of Arda and makes exact copies of his most faithful and loyal servants tin Aman the Valar, Maiar as well as Morgoth and the elves of Aman who is being paroled and Sauron and task's them to rebuild Remnant and deal with the brothers when they inevitably return to Remnant.

Long story short they arrive before Salem ever throws herself into the pools of darkness and the Valar takes pity upon her and they take pity upon her and try to teach her the meaning of death.

Eventually Ozma would be revived as a immortal of a elven type and of course Morgoth would eventually run off in pursuit of the silmarils and result in a similar war of rath and from their the story would seriously start to diverge.

Sauron would gain control of the Grimm in Salem's place and as well as the orcs who once followed his master and various states in the world would come to exist by divine intervention like Vale, Rohan, Gondor, Arnor and others which would be destroyed or be in a constant siege with the grimm and have vastly different systems of governance and tech levels because of separation.

The end result would be a insane Final Fantasy type interesting mixture of races and so forth...
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