A ODST is mysteriously transported to the Mass effect universe When a slip space accident occurs amidst the final evacuation of Reach. Will he be a help or hindrance in the fight to come? (All chapters rewritten.)

At the height of the Human Covenant war, another galactic power intervenes to aid the embattled humans. Standing side by side with the Turians, the UNSC prepares for a new phase of the Human Covenant war.

How far has Humanity truly come from it's humble beginnings, from once cavemen to those that can conquer the stars. For both were met with war yet one was welcomed into the fold while they other waged a hopeless war, and yet was able to survive. Now both and their allies now face a danger like none before, can they survive or will they meet extinction?

A small salvage ship comes across an interesting find while searching. Set before Halo 4 and before ME 2

When we started to expand past the Orin Arm of the Milkyway, we didn't know what to expect. Once we were out there though, things changed big time. For those brief 30 years we were the top dogs of the galaxy in all powers but like always when humanity reaches a higher seat of power, something always comes to make us fall... This time however the fall will cost our entire race.

B312 gets sent to the Mass Effect galaxy, he tries to go home by building a slipspace drive but problems pops up as building a slipspace drive is by nomeans easy.

Having long since combined forces, a fleet of the Humans and Covenants finest are torn from the universe they know to be thrown in to a strange and desolate reality. They will strive to uphold the Mantle against the Mass Effect's most Ancient Enemy. Will they break the cycle?

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.

It is the year 3350, the races of the Milky Way have long put aside their grievances to unite under a single banner. They held on against dangerous threats and hoped to attain actual peace. After fighting the remnants of an extrgalactic empire, forces of the MWR shall be thrust into another galaxy that's so much like their own. A galaxy that just won its war for survival.

After a long, terrible war, the Federation of Sovereign Empires forms as the product of the alliance created early in the Great War between the Covenant Separatists and the UNSC. Time passes as they progress greatly, eventually discovering the existence of other galactic governments. The events that will follow will change the course of the galaxy in more ways than one. PART- 3

Following the disaster that was the Fall of Reach, Noble Six and Auntie Dot find themselves transported to a galaxy that is almost identical to their own...only humanity are not fighting for their survival from alien aggressors. Cut off from the UNSC and ONI, the two are forced to adapt to a galaxy not ravaged by war...unaware of the dark threat looming on the horizon.

A team of Spartan II's named Wolfpack go on adventure after the events of Halo 4 and Spartan Ops an anomaly causes them to get sent into the Mass Effect universe starting where it all began on Eden Prime and they run into and ally themselves with Cmdr Shepard and the Normandy crew, Can both the Spartans and the Normandy crew prepare themselves for what lies ahead of them?

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.

The Covenant Empire discovers an ancient construct on the fringes of their domain. They interpret it as an ancient Forerunner slipspace device. Upon the destruction of a scout probe they send through the relay, they send Thel'Vadamee to the other side to secure the partner. 'Vadamee unknowingly takes the Fleet of Particular Justice into a galaxy embroiled in war with the Reapers.

Normally when one finds themselves in another world their life is going to be one filled with adventure. But after being hit by a train I found myself running for my life as the world exploded around me and literal monsters hunting me down. What's worse is that I just didn't find myself in a typical alternate universe. But a universe that was an amalgamation. MULTI X OVER SI.

After decades of ponderous travel through space the UNSC Spirit of Fire stumbles across the drifting tomb of Humanities greatest hero. Within the ship they find the means of possibly making it home, but to get there they will have to make alliances that could upend the balance of power in the Galaxy and change everything the Council races thought true.

Down but not out after the fall of Reach, Noble Six is unwittingly sent to another reality. With Halsey as a nefarious ally, and ONI as a potential enemy, his loyalties are now split and he'll need help. He'll need to uncover a sinister plot transcending both worlds, battle foes near and far, and learn to work with unexpected and alien allies. Time to pick up a new team.

When a research ship finds a anomoly at the edge of Harvests system, a young militiaman and the whole UNSC are thrown into a galaxy much larger than they could have dreamed. Pre-war UNSC, with a mixture of Halo and Mass Effect characters and some OCs, all fighting for humanitys and maybe, if time and money is left over, the Citadels future.

The last thing that John Martinez expected after he died was to be told he was destined for a greater purpose. Armed with the experiences, power, and skills of a certain Spartan-II supersoldier, he would strive to defend humanity and the innocent, and he would have his AI partner with him every step of the way. With knowledge of the future, he strives to save a world not his own.

Noble 6 no murió se fue a otro lugar muy diferente al suyo, ahora deberá salvar a la galaxia con su nuevo equipo (Advertencia: este fic tendrá Lemon en algunos capítulos)

The Reaper's return was delayed; colonists are disappearing, and mysterious incidents are happening at random colonies all over the Galaxy. Are the two surviving Reapers of the battle of the Citadel behind this events? Or is it someone else? The SPECTRES, CERBERUS and the Alliance will have to find out and put an end to this. The sequel to The Next Great Journey. Discontinued.

Synthesis has been achieved, and now, the Reapers move to help rebuild...except one. Harbinger, amazed by humanity's success, moves to aid humanity. Now, brought to this world by one called "Librarian", Harbinger must use all his cunning to protect humanity from the greatest threat it's ever known...He also must now face something he never faced before: emotion… REWRITE VERSION

Devils and Gods are two halves of the same whole. Life is sown by those whom many would consider gods but the created revolt and destroy their godly creators only to create in their wake the devils who would destroy what they themselves sought to call their own, but can devils rise to create once more or will the cycle of revolt continue on in a new galaxy.

After four years of drifting in space, the Master Chief and Cortana have finally returned. Unfortunately, not everything is the same as it was from when they left. Many creatures still lurk about in the depths of the unknown, making the galaxy just as dangerous. But what happens when the most dangerous super soldier in the galaxy runs out of his most valuable skill? [Discontinued]

After the Normandy's destruction, Tali'Zorah goes out to traverse the lesser explored places in the galaxy in search of rare materials for the Migrant Fleet. While on her adventures she finds something that shouldn't belong... she finds a Wreck... The Galaxy will never be the same.