A lone Spartan III finds himself on Horizon in the middle of a Collector attack. He finds and joins Commander Lillian Shepard and joins the fight against the Collectors and later the Reapers. He finds friends and more along his journey (FShep and Liara) (OC and Kasumi)

What would happen if the Covenant never existed? What would happen if first contact was the Council and the UNSC?

"He had never been defeated in battle. He had never failed at any task, no matter what the challenge. He was never wrong. The Imperial Admiral's only flaw was that he had been so revered, some said even more so than any Prophet. For the sin he had been exiled to the fringe worlds of the vast Covenant Empire."

The Reapers are dead, Cerberus is defeated and a new peace rains over the galaxy but Shepard know's this is not the end. Before he planned to destroy the Reapers the star boy spoke to him about an impending doom that will fall upon the galaxy and will stop at nothing until all sentient life will be consumed by the endless horde that will feast upon their bones.

A Turian patrol makes hostile first contact with the covenant during the height of the human covenant war. Will the council be able to stand up to the might of the covenant war machine? Will the UNSC be able to trust another group of aliens so similar to their hated foe. How will the specters react when they learn their not the best in the galaxy anymore.

The primordial became part of the flood but it did not simply become part of the gravemind no instead it watched over the war and when the halos rings fired it took over and set events in motion that would forever change the fate of another galaxy

A Series one-shots ideas where we laugh at the misfortune of the Citadel Council and its associates when trying to use Forerunner Technology not counting that is possible incompatibilities, Power Consumption and other dilemmas we neglect when it comes down in other stories with the Mass Effect Technology. This story will be updated as Ideas start Coming Everyone is Welcome Aboard!

During the events of Mass Effect 2, Commander Shepard discovers a SPARTAN super soldier stranded in the far reaches of the galaxy. Befriending this new ally, she embarks on her mission to shut down the collectors. During her mission she uncovers a dark truth about the reapers and the galaxies of the universe.

Años 2552 después de la guerra contra la Insurrección se descubrió un objeto alienígena ene sistema Shanxi que cambiaria la forma en que la humanidad vería en universo

While Suffering writers block I have decided to flush out the many technologies and ideas I have had about the universes I am writing, I hope this paints a better picture of my crossover universe. Thank you all for the support you have given me. Included will be weapons and technology involved in the various universes as well as historical records.

En lo profundo del vacío un antiguo ser observa cómo los eventos transcurren en los infinitos universos más en uno en concreto se centró dado que en él las creaciones de sus creaciones mataban a sus padres por la traición de sus hermanos mayores que engañaron a sus hermanos menores para facilitar la destrucción de sus padres mintiéndoles sobre cómo sus padres planeaban aniquilarlos

In 2554 the UNSC made contact with the Citadel races. But not everyone wants peace. Is cooperation between the UNSC and Citadel possible against the ex-Covenant splinter factions or will it turn into a three way war. ODST Lt Colonel John Shepard and Spartan Fireteam Crimson is right in the middle of it.

AU story of a squad of Combat Applications Group operators being sucked into the stargate made by Precursors. Can they make it back or will the bring the might of the UNSC.

Codex of an alternate history of the UNSC by 2897

Megaverse. A grand vision, on how Mass Effect, and others will be affected by a humanity forged from the influences of 1980's-2000's Sci-Fi and such. Prepare for BattleMech's, Powered Armour's, Fusion, Energy Weapons, Psychics, Magics, and more. How will the Citadel deal with a humanity that has seen and has Cyborgs, Super-Soldiers, BattleMech's, WarShips, with more to come?

Supreme Commander Thresk'Talamee is exploring an anomaly picked up by a probe, what he finds could change the course of the covenant and the war with Humanity. Admiral Jaehart Irilan is leading an exploration event to find colonies for the Salarian Union. Till he finds a probe from an unknown species, what will happen now? Rated T for violence and graphic depictions of death.

Fourth Generation Spartan Lucas Ryker is the Spartan without a team, preferring to shirk his fellow Spartans because they'd only "slow him down." However, when he's forced into cryo sleep during a mission to find the missing Master Chief due to extensive damage to the ship's life support, he'll wake up to a galaxy changed and realize working solo won't work this time.

Commander Shepard had failed. The Cycle continued, as planned. Now, the last cycle's failure will be the next cycle's trial, as the Great Journey draws ever near. Fighting against powers far beyond his own abilities, it is now up to Shipmaster Thel 'Vadamee to halt the return of the galaxy's most ancient foes, as dark powers work against everything he holds dear. (Halo AU)

After the end of the Human-Covenant War, humanity has been reduced to a VERY small number. That number being the Spartans that survived the aftermath. But even though everything is dead the Spartans still must protect whats left of humanity, by rebuilding from the ashes and repopulate. and rebuilding isn't the hard part...

Three galactic governments. One of them, a Council of Immortals who had faced the possible extinction of their species time and time again, another, a Republic which had unified from the shattering reality of war, the last, a Council which had stood for over a thousand years. When these three are threatened by an ancient power from beyond, will they be able to prevent the cycle?

36 years have passed since the end of the First Contact War after humanity achieved a costly victory against the Citadel Council. Now humanity struggles to maintain control of its status as the sole galactic superpower fighting off Resistance and Internal Struggle. Meanwhile Dark Forces are at work seeking to quicken humanity's downfall and plunge the galaxy into chaos.

The Galaxy is saved, but a threat from another universe threatens the destroy the newly found peace and union...

The war is lost. Humanity has fallen. As the Forerunner's genocidal campaign nears completion, at least one human manages to escape their wrath. Now, 100,000 years later, the last Titan once again finds herself on a journey to save humanity, uncover the past, and reclaim what was lost.

Due to unique circumstance, Spirit of Fire had to brace herself in a new galaxy... At another universe.

After the defeat of the didact, the galactic hero of the halo universe - Masterchief and his loyal blue team members embark on a strange new journey to an unknown universe in which later they come into contact with that universe's hero - Commander Shepard. Facing an unknown enemy, fighting a new war, its up to the heroes to save the day together.