In a universe filled with conspiracy theories, vast alien empires, demented cultists, and eldritch horrors, XCOM tries to carry out its duty: survive, adapt, and win.

Annette Durand expected to die when she threw the Temple Ship into the sky. Instead, she is transported into the Marvel Cinematic Universe (MCU), a world teeming with superheroes, advanced technology, and cosmic threats. Grappling with the shock of being displaced to a world of fantastical abilities, Annette decides to do what she has always done: survive, adapt, and win.

Jack O'Neill thought he had done enough to earn a retirement. Fighting the russians in east germany, killing an alien god in a distant star system thousands of light years away, being a productive member of the Colorado Springs golf club, all very laudable things, if he allowed himself the compliment. Sadly, it seems, the universe had other ideas as Earth faces an Enemy Unknown

In response to mysterious alien incursions, the Global Defense Initiative activates the XCOM Project, bringing together their finest leaders, scientists, and soldiers to combat this new threat by all means necessary. But in a world already succumbing to Tiberium and old enemies lurking in the shadows, it will take a supreme effort from XCOM to merely survive, let alone win.

After a long war with Advent and an invasion even the Elder's fear, with the final order of the Commander he sacrifices himself not only to save the world but the universe as well only to find himself in another earth were X-com doesn't exist and the world is filled with Superhero aliens and Villans

An unknown enemy encountered during a Refrain bust leads the newly formed Black Knights to a discovery that warns of a coming global catastrophe. The question is, will they be ready in time to face it?

Crossover between Game of Thrones and XCOM. As the Dead march south, a new and mysterious force from another world is poised to change Westeros forever.

XCOM was losing. It lost the first contact war, and now it was losing the resistance war. Even with the Commander to lead them, they had made little progress in destabilizing the aliens regime. But this would change with a new factor being added to the battle, as what can only be described as Fire From Above.

Sometimes, to get something done, you need to be willing to sacrifice something for the mission, like your humanity and someone's free will. There are some assholes needing a lesson and these will become common thing for me being an Ethereal and a reincarnated. SI, XCOM/Shield Hero, key people may die.

The Traitor is dead. Salem is dead. Ruby thought she could live in at least temporary retirement, but the universe had other plans. Stripped from her home, away from those she loves the most, she is forced to fight for a world foreign to her. Few others are in her position The only way for everyone get back to their homes, help X-COM win their war.

What if a duo of a rogue Sectoid and Codex crash landed on Earth at the very beginning of MHA? What if that Sectoid had to live among the people of Earth despite knowing of an impending invasion? What If he became a Hero in more ways than one? How will their arrival change human society? For the better or for the worse? (STORY STATUS: PAUSED)

August 31st, 2010, 19:00 hours, Brockton Bay, Approximately Fifteen Minutes from Brockton Bay Cinemas. The precise time and place that Taylor Hebert was fatally wounded whilst caught in the crossfire between the ABB and the E88. The precise time and place that the Queen Administrator, suborned by the Earth-born Ethereal Asaru, made Taylor The Commander of XCOM.

Gudao Emiya was prepared for the familiar experience after being chosen by the UN to lead a secret organization to safeguard humanity's survival. What he didn't expect was to lead an organisation known as XCOM. The moment he learned of the alien threat, Gudao knew he needed to call in the big guns to resolve the problem. His solution: Project Chaldea. (XCOM Reboot series!)

Earth Bet already has many truly monstrous threats: the Endbringers, the Slaughterhouse 9, Nilbog, the three Blasphemies. the Machine Army, the Fairie Queen among many others. But now Earth Bet has to face a new enemy...an Enemy Unknown.

A crossover between XCOM 2 and Girls Frontline. Complete Spec Ops missions to reclaim the Earth from the Alien Occupiers and get laid by hot raifus along the way.

In 1973 a Decepticon warship was shot down on Iceland and after a short conflict ended with a massive nuclear explosion on Iceland rendering a large chunk of the Island a restricted zone. After a massive cover-up operation, the most powerful individuals on this Planet pulled together a vast amount of resources into project X-COM. [Under Rewrite]

Перевод XSGCOM: Goa'uld Defence(Mirror Image) Оригинал: tthf .me/86hU

The year is now 2015, the first angel Adam and his children never got the chance to waken and the evangelion project was ended. The world was left in its normal state but a new threat comes for humanity from the cold and endless reaches of space. Shinji Ikari now finds himself in the middle of this conflict, fighting with Xcom against the endless might of the ethereal aliens.

Weiss Schnee, soldier in the X-COM project, volunteers for the MEC trooper project after suffering crippling injuries on a mission. Her girlfriends, Yang and Pyrrha, help her recover from the emotional toll, eventually volunteering for other projects intended to help fight the alien menace Tender, loving sex and emotional reinforcement inside. Also XCOM fight scenes, why not?

An exiled prince and princess find themselves drawn into a shadow war for the fate of Earth. But will this hidden conflict soon become overt? And are aliens the only enemies they will face?

When NID managed to convince President not to destroy quantum mirror its send to P8R-553 to establish research outpost and to properly study mirror. . Few month after properly establishing outpost and studying the mirror. All contact was lost. SG-1 prepares for recon and subsequent rescue mission.

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.

After defeating the Radiance, little Ghost thinks they can die in peace alongside their siblings but fate has other plans for them. •This story is currently up for adoption. DM me on Discord if you want to Adopt it: Protonic Protogen#9946

With the secret of Remnant's past in her hands, Ruby Rose must work with her teammates and their allies to bring an end to her world's greatest threat.

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!