The Storm king wanted to take Equestria? He made a mistake using that staff of his.
Its power awoke something that had defended the land of freedom, the mighty liberty prime.

She's a princess. If not THE Princess. You know- the ruler of Equestria, keeper of the sun, most powerful being on earth, all that jazz.
It's not your fault she's also unbelievably, irrefutably, incomparably gorgeous.

But it was your fault that she overheard you saying just that. Oh yeah, it really was. And let me just tell you something:

To let that happen was really freakin' stupid.

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Please Note: This is a Half-Life Crossover, so there will be gore.... and language... and bad puns/references (Ever seen the Minds?)... Just a warning.

The timeline from the original Half-Life game is split just before the final teleportation scene. Gordon finds himself trapped in Equestria, a seemingly peaceful dimension inhabited by three separate races of sentient ponies. However, the peace is shattered when elements of both Earth and Xen begin to bleed through the second inter-dimensional rift Gordon had created. (The first being the initial resonance cascade).

Starlight and Robbie Rotten go on an adventure to discover the wonderful ideology of communism.

Because reasons.

Inspired by Rainbow and Sonic Have A Religious Experience

It had been nearly a year since you won that labor lottery. This job had quickly turned into the best thing that has ever happened to you and your family. From the Grestin checkpoint, you had seen it all; terrorist attacks, long-seperated lovers getting back together, people trying to smuggle drugs into the country...
None of that compares to the day a portal opens to an alternate dimension just outside the walls.
Which is bad, because inevitably that means more papers for you to check and double check.
But still, a job's a job. Might as well keep a straight face about it...
And remember:
Glory to Arstotzka.

The world is being overrun with mindless Borg ponies being controlled by the evil Xenolestia. All hope is lost! Until the greatest man in history shows up to beat some sense of Humanity's greatness into them.

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Heartbroken from her friends and brother abandoning her at the wedding rehearsal, Twilight Sparkle retreats to a strange new world and is later followed by Spike and Rainbow Dash. Once there they encounter new races, strange technology, gain great power and see to the foundation of a new empire. But while there they experience constant warfare from many enemy factions that seek their destruction, turning the innocent ponies and dragon into naught but a memory. So now there is only one question: when they return to Equestria, will they come as peaceful diplomats, or conquerors?

Universe in set in a Halo/Warhmmer 40k/Star Wars mixed galaxy.

Halo is property of Bungie.
Warhammer 40k belongs to Games Workshop.
Star Wars is owned by Disney.

Not sure if the action sequences will actually be gorey, but the tag's there just in case.

Caboose was helping his friend, but took a wrong turn while looking for a bathroom, and now he's in Canterlot during the Changling Invasion... can someone explain to me how that's physically possible?

Red Vs Blue crossover

Long ago, the Seraphim granted power to the Doom Slayer that he might conquer the forces of Hell. The Doom Slayer has won, Hell lies defeated, and now he returns to the Seraphim's holy realm. His mission is not over though, he has promises to fulfill, rewards to collect, and as always, evil to defeat. Let those who would harm this sacred land tremble, for the Guardian of Equestria, has returned!

(This story now has two sequels: Legion and the novella Doom Slayer.)

June 30, 1942 The turning point in the second world war. Germany has reached a stalemate in the West and its attacks are being held off in the East. The stalemate must be broken or Germany will be defeated, in order to do so they are researching some... unconventional methods. Nightmare moon may be making a comeback in World War 2's Nazi Germany.