Tiberium. The infamous green crystal that destroys entire worlds in its wake of global proliferation. It has been a little over a century since the Tiberium threat was first wiped out on Earth, and with it, the primary vestiges of the Brotherhood of Nod. When the GDI advanced humanity to the stars, they found that Earth had not been the only target of the alien Scrin: dozens of other worlds had already been claimed by Tiberium, and the Scrin returned in full force, attacking human colonies across space, stopping human expansion. To fight back, the GDI undergoes a reformation to become the Interstellar Defense Intiative (ISDI) and enacts the Hallman Directive, designed to stop Tiberium spread wherever it may be; such a protocol brings the reincarnated ITC Methuselah to a planet being ravaged by the green crystal, and the forces under Commander Martin Alexandra deploy to stop the threat.

Crossover Material: Command and Conquer - Tiberian Series/MLP
Rated Teen for Graphic Violence and Language

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)

It occurred one peaceful night. Half of Equestria awoke to the sound like a double-shot thunderclap. A percussion heard in the skies and rattling windows from Apploosa, to Canterlot, to Ponyville. Nopony knew what it was or what it heralded for the world as it drew a line across the nation.

For Twilight Sparkle, this isolated incident might have faded from memory after a time, if not for the strange rumors of a creature sitting on the hill on the outskirts of town.

These are her thoughts given written form. These are Sparkle's Notes.

Report EVERYTHING to the Princess.

(Post-Mass Effect 3)(FemShep)
When the Reapers were defeated, the galaxy believed that Shepard and Anderson were both lost in the final battle. However, the two long-time friends were also known for not letting death stand in their way.

Waking up, in the middle of a desert, on an uncharted planet they both embark on their strangest mission yet. Attempting to find their way back to the Human Alliance, a place called Canterlot may hold the answers they seek. But first, they had to get there while trying not to draw too much attention to themselves.

Too bad for Anderson since massive explosions and collateral damage followed Shepard wherever she went, without fail.

Crossover of My Little Pony and Mass Effect.
Cover image credit goes to: CSImadmax at http://csimadmax.deviantart.com/
Chapters 1 - 6 proofread by: http://www.fimfiction.net/user/GermanDash (Pre-March 2021 update)

At the assault on Canterlot, she was a medic, but not for the Equestrians.
After the assault is concluded, a new struggle for the Changelings begins as those who survive must still find food and shelter.
Will the Equestrians simply forgive the Changelings for their assault on their capitol, and if so how bumpy a road is this going to become?

This story is a sequel to An Affliction of the Heart

Kuno and Warden are happily together now, but events are transpiring to force them from their happy life.

The reappearance of the Crystal Empire causes Kuno and Warden to give up their new-found home. And Kuno, ignoring the fact that they're two different species and completely incompatible, decides that she wants a baby.

Spartans never die, they're just missing in action. This has never been more true for Jorge-052 as, after activating the slipspace drive that was supposed to kill him, he is instead flung into a strange world where war is but a distant memory. Will the aging soldier be able to adapt to this new peaceful planet? Or will his only salvation be found in finding a way back to his own chaotic universe?

(It's my first time, so be gentle)
Now featuring a TVTropes page by Sabo88

Being left for dead in Trottingham was a major disappointment for the little changeling prince, this is true. Being adopted by a paddle-happy pony wizard, this ‘Star Swirl the Bearded,’ was also a bit of a downer at first. But Stasis still manages to appreciate the savory side of things.

Unfortunately, not all pastel prey are as soft and as chewy as they may appear. Stasis has seen the golden soldiers and their goddess’ wrath, and if he can’t keep his true nature a secret, he may see them yet again.

And of course, not all changelings see fraternizing with prey in the same light….

Cover art commissioned from Raikoh-illust

There's only so much failure a changeling can tolerate. For Shade, once was enough. Years of training and preparation in the hopes of achieving a new life for himself and his colony wasted because of the negligence of their leader. It's time to try a different approach; if force won't work, then maybe peace and diplomacy will. What could go wrong?

A chance encounter in a creepy forest; A tree filled to the brim with books; A brief and sudden rain shower. These are all things that will change Shade's life forever.

Reader, in ancient days, the old lords of the world numbered in thousands. Then hundreds. Then even less.
Now, they are found only in tapestries and fanciful ballads.
The creatures are all vanished. All but one.

Rumors say there are more of him, somewhere far away. A young and supposedly gifted mage called Star Swirl, and Heartstrings, a gentle spinster, have joined him on a journey to find the rest.

Featured in The Royal Guard's Fic Spotlight #5
TV Tropes page (that could use more love)