Spy.

Potions Teacher.

Traitor.

Murderer.

Severus Snape was known as many things. But right now, he was just confused.

"And just...what are you all supposed to be?"

Something has happened and Twilight finds herself in a strange and dark new world. The Bipeds here have strange magic, advanced technology, and a lot of problems. She needs a few friends, and they just might need her. WORM crossover. Deadpan29 has created some great supplementary material that is canon to the story.

This story is a sequel to Stardust

Times are changing for Equestria as Twilight’s return brings with it news of people and cultures from beyond the peaceful world everypony knows. Aid and volunteers are freely offered to help the besieged humans of Earth because every Equestrian knows that’s what good friends do. Unfortunately, making friends can also have the unintended consequence of making enemies.

When the monsters besieging the humans strike at Equestria with a level of brutality not seen in over a thousand years, the cry for help is sent to all the kingdoms of the world. Honored allies step forth to fulfill ancient treaties and oaths. Enemies, old and new, bury their grievances. An alliance never before seen in Equestria will be created to combat the monsters from the void.

And because of these events, a grim but welcome sibling to the XCOM project is born.

(XCOM/FiM Crossover)
(Sequel to Stardust, which I recommend reading before starting this. Fortitude Amicitia and Broken aren't required reading but are supplemental to the storyline)
(Gore tag for blood and violence)
(Alternate Universe tag because of the divergence from canon that Stardust has caused)
(Uses elements of Season 4)
(Coverart produced by the amazing Carnelian!)
(Many thanks to Arzoo, BradTheBrony, Vandenbz and Setokaiva for prereading!)
(As of 03/07/2016, the prereading team consists of Arzoo, BradTheBrony, Noble Cause and Metallusionsismagic!)
(Complete with it's own TVTropes page as part of the Stardust continuity. Could use some updating!)
(Character tags will be added as chapters are added!)
(Featured 5/12/2014! Thanks folks!)
(Possible spoilers in the comments! BEWARE!)

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!)

The Elements of Harmony. Six artifacts of legendary power that have provided for the peace of Equestria for over a thousand years. While Queen Chrysalis managed to deny the ponies their ultimate defense, she still lost to a different unexpected surprise in the form of a love-powered shield spell.

However, the Elements won't be so easily denied. Unbeknownst to anyone, they awaken in their vault and cast Chrysalis into another world to teach her a lesson or six about life and harmony.

Stripped of her power, trapped in a form unfamiliar even to a changeling, and at the mercy of the locals, Chrysalis must learn how to get along with others before she is allowed to return to save her hive. And if successful, she may just be allowed to keep her new friend... If he's willing, and if he can survive the drawbacks of being one of the rarest changeling classes ever seen:

A breeding drone.

Join a spoiled rotten queen and a workaholic electrical engineer in the retelling of an adventure that brought them together across the boundaries of space and time. Because sometimes, a little change isn't all that bad.

(Changeling Drone 'Gazer' design artwork courtesy of oFimFiction.net member 'More Dakka')

Set after the events of The Dresden Fillies: False Masks, with permission by psychicscubadiver. Cover art by Appletank, with my thanks. Edited by SilentCarto, also with my thanks.

Warning, spoilers from MLP, the Dresden Files, and the Dresden Fillies may be present. Please be sure you are up to date on all three.

In their desire to rid Equestria from the threat of Obsidian, the Order Triune reached out to a power they did not truly understand, a power perhaps more evil than that which they sought to end, a power from Beyond.

Such reckless actions come with consequences.

In the dark depths of Asgard, Loki Odinson sits, punished for his crimes on Midgard.

But new developments cause the wayward son of Odin to escape his prison and seek refuge across the Nine Realms in a land very much unlike any he has ever seen: Equestria.

While Loki makes a new life for himself in Equestria, Thor must once again gather together the Avengers and give chase to his escaped kin. But will the lies Loki feeds his newfound friends send the Elements of Harmony on a collision course with the protectors of Earth?

(Cover image by the wonderful Reiduran)

This story is a sequel to Stardust

Twilight has finally returned home from the harrowing challenge that Discord set upon her, and the residents of Ponyville and the Elements especially look forward to having their dear friend returned to them.

Twilight, however, has changed. Still suffering from her injuries, almost incapable of using magic and haunted by the memories of her time on Earth, she becomes increasingly withdrawn from those who were closest to her. Will her frustration at her current state and her friends inability to understand her experiences cost her what she valued most before Discord's bet?

(Sequel to Stardust, familiarity with this is recommended!)
(Proofread by Arzoo!)
(Coverart commission drawn by the amazing KairaAnix!)
(Crossover with XCOM: Enemy Within, though the crossover and human elements are minimal)
(Featured 4/28/2014, thanks folks!)

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

"Who are you?!"

Lyra wrenched her hands together, strands of teal hair falling over her golden eyes. Suddenly, she seemed so small. She didn't answer. Couldn't? It hurt to remember, hurt to say. She was lying, or maybe it was the truth, and she really didn't know.

Cover art done by the amazing Conicer and bunnish!