On my way back from the movies, I was mugged. Like the idiot I was, I chased him down and ended up getting shot. I woke up... but I shouldn’t have.

Upon waking up and finding himself in Equestria he tries his best to help the ponies and to earn their trust! While learning his place in his new life in an ever-expanding world!

An undead Emperor in need of a new body. A Spartan lost in space. A ragtag team on a suicide mission. What do they all have in common? They all wind up on the magical world of Equestria, where war has been forgotten. That, however, is soon about to change.
When each of them is about to be retrieved, ancient evils arise to unleash hell upon the unsuspecting world. When the forces of three galaxies clash around them, can our favorite ponies hold out against the onslaught?
This is a crossover involving Warhammer 40k, Halo, Mass Effect and MLP, and is also my first fanfic. Comments and reviews are welcome.
Rated T for language, violence, and general adult situations.
Now on Tv Tropes!

After a freak Geller Field accident, Ursarkar E. Creed wakes up in Equestra. He soon finds himself in a battle of wits with Discord, while trying to adjust to the strange, candy-colored world he appeared in.

Jvarn, Kilm, and Hayt are all comrades in the Imperial Guard. Members of Veno Six's Sixth Regiment, they traveled space to fight the enemy's of the Imperium. During a routine boarding action, however, a Chaos trap pulls the three into a new world entirely.

Can they resist burning the xenos long enough to find a way home?

Bored and tired of staying in whatever chaotic Warp corner he was in, Leman Russ decides to go visit a random planet and enjoy himself. Too bad alcohol is illegal and a daemon keeps pestering him.

A totally random one-shot made up while out on the road.
I regret nothing.

THERE'S A SEQUEL!
Read Pinkie Pie the Space Wolf now please!

The most screwed-over chapter in the Imperium's history. Cursed to die horribly, turn to Chaos, or both wherever they appear.

What would happen when one is finally able to rest after being placed in possibly the most peaceful and relaxing world in the known galaxy?

Set between MLP:FiM Season 3 and 4.

Sonic, Tails, and Knuckles find themselves against Dr. Eggman once again, the scientist wanting to use the Chaos Emeralds for an unknown plan.

Unfortunately, the plan involved sending the trio to another world, which he plans to conquer as well as seek what are known as the Elements of Harmony. The fate of Equestria hangs in the balance as the heroes of both worlds must join forces against Eggman's robot army.

Can Team Sonic and the Elements foil Eggman’s latest scheme or will they fail?

A lone clone trooper finds himself waking up within the dark confined transportation bay of an L.A.A.T. he'd been riding on. He learns quickly that he's apparently the only surviver of a harsh crash landing, leaving the ship in heavy disrepair.

With nothing to gain by simply sitting there, the clone ventures out in an attempt to find civilization and hopefully make his way back to the Grand Republic, and the galaxy-wide war. However, he soon realizes that this task isn't gonna be an easy one, and this planet seems to host quite a few oddities and mysteries. From its population of colorful ponies, griffins, dragons, and tons more creatures, to its primitive technology and mystical ways of life.

But another factor is quick to present itself, for this entire planet and its inhabitants are blissfully unaware of the blazing war that's raging just beyond their skies. A war that could come raining down on them and destroy their peace in seconds...

Featured: 6/29/19, 7/5/19, and 7/19/19! Thank you all so much!

As the final battle dawns, the Emperor summons the full might of his forces in a last bid to destroy chaos. Seeing the importance in Equestria, he sends a portion of his space marine forces to defend it knowing that Abaddon will strike there. For if Equestria still stands where Terra falls, there may still be hope.
Takes place after "finding malcador"

A prophecy leads the Imperium of Mankind to deploy a Deathwatch team deep inside the Warp. Soon they encounter Equestria and the "Six Blessings" it harbors. How will ponykind react to the fierce and grim protectors of humanity? The two sides will need to find common ground, and fast: a new threat has arrived in Equestria, and they will stop at nothing to see this fragile alliance destroyed...

A Warhammer 40,000 crossover. Special thanks to csimadmax for creating the cover.