This story is a sequel to Stardust

When Equestria’s newest member of royalty asks for aid to be offered to her friends from abroad, the best and the brightest volunteer to serve. Captain Steel Song of the Dusk Guard are immediately mobilized to help XCOM defend their world from the enemies that besiege them. However, their first joint operation with the humans takes a turn for the worse and they quickly find themselves fighting for their lives against the full force of the monsters that threaten Earth.

(Stardust/Dusk Guard crossover)
(Coverart provided by a friend of Viking ZX!)
(While familiarity with both stories isn’t required, it is recommended)
(Many thanks to Arzoo for pre-reading!)
(All screenshots can be found at XCOM.wikia.com)
(Featured on 3/13/2013. Thanks everyone!)
(Now has it's own section on TVTropes as part of the Stardust series!)

Under assault by the plunderseeds, the Tree of Harmony remembers the first morning of the world, and her delight in discovering life, laughter, love and serenity.

There is a secret in Equestria. A secret the newly crowned Princess Twilight Sparkle doesn’t dare to believe. Like puppeteers pulling on marionettes, they have influenced Equestria for better and worse since the fall of Discord. So far they have been benevolent, but their potential for evil is vast. What’s worse, she doesn’t know their name. She doesn’t know their mission. All she knows for certain is one thing.

That they all seem to be zebra.

Moxie gazed over the stallion in front of her, as the crowd stared at them in turn. Fellow nobles, dignitaries, and her parents had all gathered here, in the balmy mansion of her birth, to witness this occasion. The final words had been said, and they were now officially husband and wife. But she was not happy; this was not her wish.

She ran her hoof down the lock of blue hair entwined in her mane. Her whole life had been decided for her, everything coordinated to the tiniest detail. What she had learnt, how she spent her leisure, who she knew, whose company she enjoyed, whom she had pledged herself to, everything... except the one trip she had taken to Canterlot without the permission of her parents, that is. The glimmering blue strands linger as a testament to her last free action...

Featured on EqD: 13-11-2013

Pathfinder has a gift and a curse. He can, at times, fly between worlds. The first world he discovered was filled with love. The second world was filled with poison. In all of Equestria, in all of the Realm Undying, is there no safe place for him?

Cover art by AnanduKune, with permission.

After his defeat at the hooves of the Bearers of the Elements of Harmony the stony figure of Discord was dragged far, far, far out of Ponyville where the good ponies could eventually forget the name of their tormentor...

...again.

But, it seems, as the months have passed some creature in Ponyville has not been able to put aside what had happened. Now, that creature approaches, and it seems as though he'd like a word with the immortal spirit of chaos...

Applejack is hell-bent on beating the high score on ‘Sea Pony Symphony’, her favorite pinball machine. Unfortunately the game has a dangerous twist in store for her. Will an unlikely retired pinball wizard be able to save her from a musical fate that is truly worse than death?

In the final days of her life, an exceptionally faithful student muses on the subject of her perfect and immortal mentor Applejack.

Now with Spanish translation by Spaniard Kiwi!

Pincer is a changeling, a proud soldier of Queen Chrysalis. After the failed invasion of Canterlot, he finds himself trapped and at the mercy of Princess Celestia's Royal Guard. Believing that Celestia sees his species as nothing but soulless monsters, he prepares himself for the worst. The weeks crawl by, marked by an endless series of questions he will not answer for fear of endangering his friends and family at The Hive. As his nerves wear down and his interrogators learn just how ruthless he thinks they are, they have nothing to report but his belief that they will kill and destroy his kind without mercy.

Celestia steps in to prove him wrong, and what Pincer learns leaves him questioning everything he has ever known — but also gives him hope for what he'd never thought possible.

Cover art commissioned from http://www.demonkings.com.

Now with a TVTropes page.

This story is a sequel to Inscape

Penumbra seeks gainful employment. Hilarity ensues.

This is the third story in The Petriculture Cycle. The TV Tropes entry can be found here.

Artwork by Page Turner.