When a mysterious portal appears at the edge of the Oort Cloud in space, a UNSC fleet is dispatched, only to find themselves in a completely different universe where yet another ancient Galactic threat is upon them. Post Halo 4, ME1.

The Enterprise is shot through a black hole, sending it into the far depths of space. The year is unknown, but the Enterprise finds a giant ring that is fully capable of supporting life. The UNSC Pillar of Autumn flies into orbit and comes under attack, with the Enterprise in the cross fire and Kirk, Spock, and McCoy on the ring below.

collective codex for HALOMExCnc: Universal Perversion

Human, Covenant, Citadel, and non Citadel was united under single banner to face biggest galactic threats which threatening their very existence. Shepard was proceed to save entire of galaxy. (Read codex's first, please)

Thirty-five years have past since the end of the Human-Covenant War. Having reclaimed most all its previous glory, the UNSC exploration locates a massive artificial construct in the outer orbit of a star. While investigating the object alongside their Sangheili allies, new aliens come forth from the construct and bring humanity into a fate they never expected. ON HIATUS

It has been seven months since Adam and Anthony became Razor and Patriot. And now that the war rages throughout the galaxy, they will need all of their strength to help them get through these dark times. Feelings for close friends will begin to grow, secrets will be learned, heroes will be tested, and an ancient evil will rise. [AhsokaxOC, BarrissxOC]

After the end of the great war, things become more tolerable for the belligerents and willful survivors of the Human-Covenant war as the new generation has looked forward to joint peace, prosperity and technological advancement. During these times, an Infinity-class ship is sent to investigate a Forerunner artifact, a now commonly increasing sight, and is sent to a trip unprepared.

When the four great races rise up to reclaim what was lost after the Great Cataclysm. How will the Citadel Counsel react. (Its an idea that just will not leave me alone. Is Teen for now may change in the future or maybe not at all.) Up for Adoption

After an incident with a slipspace jump, a lone Spartan finds himself stranded on the edge of the galaxy on a world inhabited with the strangest creatures he has ever seen. He must overcome the many dangers that this world hides, as well as his personal demons. But must a Spartan always be alone? Part one of the Scattered series. - in process of a rewrite.

KH halo and a few other main characters from video games in this fanfic

Avenging the past leaves you with nothing, a Character from Mass Effects learns the hard way that there are worlds worse then the one they started in. One Shot, World Building

Masterchief wakes up after his long cryo sleep only to learn that everything he once fought for is now history. UNSC, Covenant everything. Can he once again become the humanity's greatest hero or someone else will carry his legacy?

Whether it be misfortune or an uncompromisable force, the Arbiter crash landed on Earth. However, it is not the same Earth he Glassed to get rid of parasites. This Earth is instead decimated by war between two factions, Human and ANOTHER Hive Mind species bent on destroying the world. This time however, the Arbiter is less than welcome to join the Humans.

My first crossover

During an excavation on a lake in Reach, Halsey and a group of workers unearth a large, unknown object. As a result a mysterious organization called Ormus launches an attack on the UNSC colony. From there Alister, a skilled UNSC mobile suit pilot, along with several teammates get embroiled in a galaxy-wide conspiracy that threatens to rip apart the fabric of reality. R&R. ON HIATUS

Fire Team Destro talks to the RWBY fans about Pairings. nuff said.

What if John went through a time vortex in space sometime between Halo 2 & 3 and finds the Ghosts? Rated T for Language and some violence.

This is an Omnibus of Halo Characters (some of my own devising) meeting with some interesting dilemmas. Change an Event or Six, New Beginnings, We're Not in Kansas Anymore, Could you point the way to the nearest Moa? , and The Machine Spirit is acting up again! . Galaxy spanning, as well as temporally expounding! Ratings and reviews make the fanfic get better!

Khamsin is really bored. Fortunately for him, a once in a lifetime event will cure him of his boredom.

When a portal opens in the middle of space, Master Chief forgets his troubles with losing Cortana long enough to make possibly his and the UNSC's final stand... In New York City. The SPARTAN II's III's and IV's join the fight through portals from the past. Is this the end? Crossover of The Avengers movie and Halo 4's afterstory.

When you become an extragalactic entity, meeting other galactic civilizations becomes an inevitable occurrence, and First Contact rarely goes well for the less-advanced society. Pre-ME through ME3. Rated T for language and implied sexual situations later on. Extremely Light parody on Halo OPness AKA Halo tech taken to its logical conclusion.

Lt. Bloodhound of the SPARTAN Program from the UNSC crash lands on a blocky world. The covenant try to destroy it! Do they succeed the first time? Find out! Warning Short Story!

"What's a Halo?" / "I have no idea, Number One, but I suspect we will find out soon enough."

A "what if" story. The "what if" scenario asks "what if the Federation, specifically Picard and his crew, were to encounter a divided Covenant where one faction is led by the Sangheili and the Jiralhanae lead the other.

Fleeing from their universe, the reaper defector Enigma and his allies stumble into a new conflict. A conflict where the victim is out numbered and faced with extinction. The white reaper is not about to sit on the sidelines and watch this time... *Please read 'Mass Effect: The reaper Enigma' before reading this to reduce confusion.*