Two Universe collide after the Forerunners fall and the Reapers return, will the two branches of Humanity placed in their respective Systems by a Forerunner Monitor unite or fall, only time will tell in this epic clash. When the UNSC Exploration and Research Vessel Light of Sol discover a strange artifact, they are opened up to the rest of the Galaxy after millennia of isolation.

During a Batarian Slave Raid on the Systems Alliance Colony of Eden Prime unknown defenders both Human and of unknown alien origin aid in the defense. While the UNSC and XCOM join forces under a thought long dead UNSC Rear Admiral and navigate this new universe, how will the future of Mass Effect change and will it change for the better or worse. - Mass Effect - Halo - XCOM Cross.

Commander Shepard and his team have gathered together the races of their Galaxy in an effort to defeat the Reapers. But is it enough? When the team comes across a strange woman they find out that if they are to truly defeat the Reapers once and for all. They will need all the help they can get. But not from their Universe. Multiverse Crossover! Chapters 6-22 Being Rewritten!

Occurs after the events of Halo Infinite. Cortina finds out about a new enemy from the void of space called the reapers who are trying to rule the galaxy sending a warning to her former allies and enemies to unite the, she assigns chief espranza and the Weapon on a mission to unite the Citadel species to fight a war to end all wars in the Galaxy, can they do this task

Soon after the war with the Covenant, humanity discovers a Mass Relay that opens the door to the rest of the galaxy. But it also awakens the greatest threat humanity has ever faced. Male Shepard/Liara. OC/Krystal (from Star Fox).

A Crossover fanfic I did as a Fiverr request.

This is a Mass Effect - Halo - XCOM Crossover. In the year 2084 during the Asteroid Belt Offensive XCOM Elite Unit Strike-1 discovers an Ethereal Station but must Psionic Teleport away but something goes wrong. In the Year 2552 the UNSC Fearless an Orion-Class Assault Carrier is forced to escape Reach under heavy fire, during the Slipsapce Transit something goes wrong.

The reapers brings new galactic superpowers into the war after invading the Orion arm of the galaxy. will the conflict unite them against a common foe or will they open conflict with each other.

ODST Captain Nathanial Renkov unintentionally becomes the first Helljumper to survive being dropped through a Slipspace anomaly. The problem? He has no idea where is and is surrounded by aliens the UNSC has no record of. Even worse? No one knows what the UNSC is. Follow his story as he tries to make sense of his new surroundings while trying to survive a new galactic threat.

AU. Spartans never die. But we all know that's not true. A terrifying new enemy approaches and only time will tell if the forces that be can stop them.

Master Chief wakes up in the Mass Effect universe and joins Commander Shepard in an effort to stop the Reapers. With time running out, can they stop the extinction of every species, or will they fade into legend?First, they got to stop the Reapers though...

In the vast multiverse events can happen that should never happen this is the story of one such event in a a universe that was should never have been.

There was more on the line... Yet plans and webs were made. Rated T for violence, death, and profanity.

Noble Six was alone after the death of Emile. The Pillar of Autumn had left Reach, leaving the lone Spartan behind. But what if instead of dying on Reach, fighting to his last breath, Six survived? What if he escaped Reach and headed for Earth, only to end up in another galaxy, in another war? Will he agree to fight the reapers alongside aliens? Find out in Noble Effect

After the Great War Humanity was a different creature. Their brush with extinction left them cold and vengeful, and so they sought revenge for the transgressions of the Covenant species. With their eradication Humanity, driven by xenophobia, took their position as the unrivalled power in the galaxy. However, will a xenophilic alien federation, in a new galaxy, change their outlook?

A bold new world - A strange new reality - Fresh trials, tribulations, allies, and enemies. John fell through the portal from the Mantles Approach, but his luck works in mysterious ways. Now stranded in an alternate reality, how will he strive forward? The galaxy takes a sharp turn from the world we know, and the Reaper threat looms just as large, but no longer so uncontested.

A Halo/Mass Effect crossover, though not a typical one. This is the story of the last Forerunner, sent to a different galaxy entirely. How will he handle himself in this new glaxy where everything is different. Adopted from drich147. I corrected a mistake in chapter 3 regarding how long he has been there. I do not own Mass Effect or Halo.

The USS Voyager comes face to face with the massive ship that is the UNSC Infinity after Voyager's nearly fatal first test of their quantum slipstream drive. Getting home isn't their only issue. They will have to work together in order to unravel the ancient threat that plagues the new galaxy that they find themselves in. Star Trek:Voyager, Mass Effect, and Halo triple crossover

Fifty years after the end of the Human-Covenant War an ill-fated UNSC expedition opens Relay 314, revealing a civilization unprepared for their arrival, and relics from a terrible past.

A Reaper is launched from it's home galaxy during one of their many cycles, and spends countless years floating through the empty void of space. It's unintended destination results in the nearly destroyed machine unknowingly put in the middle of a galactic war between a coalition of religeous zealots and an ambitious race expanding over the stars. Picks up at the start of Halo: CE.

Max Barrett, the child prodigy, is the single smartest man that humanity has ever or will ever produce. Regarded as both the greatest mind and as a naturally born supersoldier Max is guaranteed a life of luxury. Unfortunately, a single good deed has landed him in an unusual situation: he finds himself in a Halo/Mass Effect crossover universe.

For a writer looking for a Halo/Mass Effect crossover idea. Free range use of what's inside. Details and new combined timeline of the two universes.

The family and friends would have been know that Raine would be dead or she could be alive somewhere in the galaxy. They may have hope that Raine will eventually come back home to her family and friends. Wherever she is... or whenever she is found. Things are going to be different in the future she might discover something new... in century later.

He's the last of his kind, and he's way out of his time. Waking up to a universe under the control of a despotic Artificial Intelligence was the last thing he expected. But the good news for him is that our favorite red-haired commander is all-inclusive and totally supportive of anyone, human or alien. Even if he's kinda responsible for the whole Reaper thing... whoops.

Humanity, left to its own devices for centuries, comes into contact with the Citadel Council. A misunderstanding leads to hostile first contact, and the UNSC is drawn into war with the Council shortly after the Insurrection's height. The Council finds itself face-to-face with a species that has broken the shackles of Mass Effect Technology. The Era of Humanity has only just begun.