Colonel John Shephard has to face the toughest mission of his life. Hunt down a rogue Specter and repair his relationship with his sister. Just another day in X-Com.

In the Year 2015, Earth was attacked by an unknown Alien Empire. With X-com they fought the alien menace again and again, overcoming the Odds and Forging a new Empire comprised of the former enemies enslaved to the Elder's will. Now forged into an empire the likes of which the galaxy hasn't seen, they take their first steps into the great Unknown. Major Crossovers and OCs.

A series of snippets telling the story of the Human-Citadel war, fought between the Human X-Com and the Turian Hierarchy. Originally published on Reddit. Based on the original X-Com UFO Defence (1994), not the Reboot!

We defeated the Elders. We took their technology and made it our own to advance into the stars. After so long we surprisingly made allies while unsurprisingly made enemies. Now we find our place and stand firm in this galaxy. Pray to those that believe us weak. For we will not.

The year is 2175 and the galaxy is at peace. In the Terminus Systems, Battarian sponsored pirates gather, willing to test the resolve and capabilities of the System Alliance. At a X-COM facility, the last surviving soldier from the last war has been released from stasis, ready to be healed. Meanwhile the Ethereals plot in the shadows beyond the Relay Network and Nazara awakens...

The obligatory Mass Effect-XCOM crossover, just set a little earlier than most. The Migrant Fleet is looking for new worlds, new tech, new allies. Humanity would very much like to not be exterminated by aliens from beyond the stars. SYNERGY!

The dominion has stood strong for centuries since the Ethereal war, under the guidance of the Emperor the Terrans have risen beyond the wildest of dreams, what happens when they encounter the a race of council exiles in desperate need.

Dr Tygan has, on the orders of the Commander, been studying an orb of some kind that appeared out of nowhere in the North American region. This orb happens to be a gateway to another dimension and some of its inhabitants have been dumped into the year 2035 on a world run by aliens. These adventurers are not prepared for XCOM's method of war or its attitude to non-humans.

X-Com, Mass Effect Crossover, Space Engineers elements. As Humanity pushes off the Ethereal threat a cycle continues, while a vast, unknown Galactic Civilization lives right upon its borders, bringing with it possible friends, or foes.

Humanity, a species that has been invaded twice by the Ethereals, their thrall species and occupied by the ADVENT coalition have finally left the Sol system and expanded into the stars. They knew the Ethereals feared something bigger & badder than themselves. They knew the Protheans has been wiped out by the same threat. The time of the cycle has arrived and extinction awaits all.

Following the destruction of the Temple Ship, humanity rises to become stronger than ever, and is determined that they will never again allow any enemy to repeat what the Ethereals did. In Vigilo Confido.

In the wake of the revelations of the Elders' Avatar project, XCOM did what they always do: Anything they had to. Covering events from XCOM2, TFTD, The Martian and Mass Effect, this is the first book in the Protectors series.

The Battle of Yellowstone was the turning point in the Second Ethereal War, celebrated by humanity far and wide in their crusade against the Ethereal menace, but not everything the books about this bloody battle say are true... This story is a spin-off from the fanfic "The Human War", made by generatedname. This story has the author's permission and blessing to exist.

One shot in my Unknown Contact Universe-adapting legal systems to a post-Ethereal Invasion world. Warning: Contains legalese (lots of) and references to sexual assault (sort of).

The Citadel Council is a peaceful conglomerate of races, blissfully unaware of the horrors that lurk beyond their space. Humanity, meanwhile, is a race that has fought against these alien horrors ever since they made contact. What will happen when the two societies meet? Will peace follow war? Or is the Citadel Council doomed to fall to humanity? Rewrite of When Civilizations Meet.

With Advent defeated and the Elders dead, Xcom becomes the ruling government of the earth and her colonies. While the former advent forces are taken under Xcom wings, not every alien is as friendly as them, so it's up to Xcom to do what it does best, and that's not miss a 95%. Under Rewrite and is now back (Big)AU First Contact-3rd game. Xcom and Mass Effect Crossover.

A collection spot for side stories taking place in the world of The Human War that I thought would be nice to write up, but don't quite fit into the primary narrative.

A fun-loving asari mercenary finds herself a little in over her head when she ends up abducted by terrifying aliens from beyond the galactic frontier. These asari-like creatures call themselves 'humans.' They seem to be secretly nosing about on the borders of known space, acting through proxies, conducting covert operations, and they've got a deal for an enterprising asari...

Every race thus far has utterly failed to stop the Reapers, always embroiled in pesky politics and wars to take any notice of the coming storm. This time though...this time is different. Can you feel the equally raging storm coming? I can. Can you? Side story: Incursion: Alliance Effect *Earlier chapters rewritten. Discontinued*

Two cycles ago, the Reapers wiped out the Ethereals and their Inusannon masters, the High Chorus. As the Inusannon burned, however, Humanity survived, immolating billions so that a few could escape and rebuild. With Commander Jack Harper in charge, however, even the best-laid plans can meet complications. XCOM returns to a Galaxy they can hardly recognize. [AU]

One hundred and seventy years after the Temple Ship, humanity has spread out among the stars and found to their surprise that the aliens they thought of as monsters and conquerors were saints and jerks just like everyone else. That and as it turns out the Ethereals were really, really sorry.

After achieving victory in the Ethereal War, humanity rose to replace the Ethereals as the leaders of the conglomerate of species. Now, they have encountered another interspecies alliance and learn of the new part they have to play.

When a sarcastic, rich, genius, loses his parents to slavers. He goes out in the galaxy for revenge on that Batarian. All the while, rebuilding an old organization, and discovering something worse than Batarian slavers.

Follow the adventures of Andreos Cain, a gun for hire as he winds up coming into contact with the secret organisation known as XCOM. Cain's life of shooting for the highest bidder is suddenly changed when he is "convinced" into joining up to defend earth from an all too real alien threat.

The war is over, the invasion beaten back, and X-Com disbanded. The Commander and the remaining X-Com personnel unwilling to adhere to the council's orders takes matters into their own hand and looks towards the stars. Vigilo, Confido! A new take on the X-Com/Mass Effect crossover.