After a rather odd storm over the Everfree, Twilight and her friends are sent to look for a castle that apparently fell right out of the sky. But finding it will not be the problem; the challenge comes from dealing with the inhabitants. It might have been better if they had never gone looking in the first place...

Now in its native language thanks to System!

The Conversion Bureau never made any sense anyway, but here are some places where it would have made less sense.
Not necessarily worlds where the ponies would lose the fight - just worlds where conversion wouldn't logically work.

Before suggesting a World, read the index to make sure I haven't done it already.

Captain America: Civil War crossover.

This story is a sequel to A Beautiful New Age.

Being the first of her species to travel to another world, seeking to—and hopefully—make peace with its leaders, Princess Twilight and her friends see nothing but a bright future ahead for both Earth and Equus. It all seemed to be going so well.

However, after a devastating terrorist attack brings a mighty blow to the Avengers, Twilight and her friends are unwillingly placed as the next targets. Tensions arise between Iron Man and Captain America, and new players soon emerge into the battlefield, threatening to tip the tide into conflict amongst the shattered team.

To deal with the true threat behind the grand scheme, Tony Stark and Steve Rogers must put aside their differences before the inevitable comes crashing down on top of them…

Two sides of good clashing together, fighting for what they believe is right, breaking partnerships and ending friendships… human and pony alike.

Big shoutout to Shrekzilla for his amazing job on the artwork!

Sequel: Infinity Era

CEO of Aperture Science, Cave-In, ponders the future of his company and suggests major changes to his perky assistant. Surely this won't alter the future for a certain taciturn test subject?

One-shot portal crossover. I pretty much ponified the characters. How original!

Part of the Harmony's Warriors Universe

When a megalomaniac comes from the stars with the goal of enslaving all of Equestria, it's up to a soldier from the past, a redemption seeking businessmare, a demigod with an ego, an eccentric sharpshooter, and an introverted civilian with a dark secret to put a stop to it.

Of course, forming a team is always harder then it looks, and the six must first learn to work together, and set aside their differences, before they can tackle the greater foe.

For those of you wondering, yes, this serves as a sequel and mega-crossover of my previous stories, Iron Mare, Flutterhulk, Soar and Captain Equestria. Luckily, while this story will obviously include references to the previous stories, I'm going to also make sure that if you haven't had a chance or the time to read those stories, you can still understand what's going on here.

After all, what's the good of making a story only a select few can get any enjoyment out of?

The "Other" and "OC" character tags are to cover my bases, since I can't include every character in the tags.

Also, I'd like to note that the cover art was the best piece of fan art I could find with the Mane Six as The Avengers. The actual casting is different. Just a note.

A Metroid Crossover

A meteor, resistant to magical manipulation, crashes in Equestria, Planet Equis, and soon spreads an unknown poison throughout the land. Containment is all but failing and the Princesses have little power to stop the spread of the Great Poison. The Elements of Harmony are of little use as no knowledge exists of this threat that consumes all life. Help comes from a certain Hunter, clad in metal.

Samus Aran will not only fight for her life as always, but her own sanity as well as these ponies that she begrudgingly starts seeing as allies. New horrors and abilities await her as a reason to fight slowly festers within her, possibly unlocking something she had been denied for so long: Friendship.

Notes and Resources:

This takes place after Echoes. The events of Corruption will have not happened yet. In terms of MLP, consider everything up to and including the Crystal Empire. Princess Twilight does not exist here, etc. The official Metroid Timeline can be found here.

As well, this story references the manga in many places. Reading of it is not required and I try my best to explain the context, but if you're interested, both volumes can be found here.

EDIT: This story was written over two and a half years, beginning in 2013. You'll probably notice the difference in writing as the chapters progress.

An interlude between Flammenwerfer's fics Metroid: Equis and its sequel, Metroid Equis II: Duality.

The war is over. Equis has survived the dual threats of Phazon and Space Pirate invasion. A new era of peace and prosperity covers the planet, as new trade routes between Equis and the Federation - centered in the country of Equestria - bring new technology and wealth to the nation, and the world.

But these thoughts are far from Fluttershy's mind. Her thoughts are focused on her friends - especially Samus, far distant from the world - her daily life, and her animals.

In particular, a new one... One she's never seen before. But she calls Fluttershy Mama, so of course she'll care for the little flying jellyfish, whatever she is.

What could go wrong?

Edit: It isn't required to read Metroid: Equis to enjoy this story...but it's highly recommended to read it anyway. It's a really good story.

This story is a sequel to Metroid Equis

With the culmination of events on the BSL Research Station, Samus Aran is finally able to come back to Equestria, Planet Equis; to come back home. Much has changed in her absence, but it is still the friendly, peaceful, welcoming planet and nation that she left behind two and a half years prior. With the Space Pirate threat neutralized and the secret, illegal Metroid militarization programs destroyed, it appears that Samus can finally take another massive breather with her friends and enjoy some well-deserved rest, recovery, and relaxation. The galaxy is finally at peace.

At least... for a short while.

A new enemy, one much closer to home, soon rears its head, threatening all of Equestria and Equis with complete and utter annihilation. Their mission: revenge. Samus will fight with all of her being alongside her allies against an enemy who would like nothing more than to see all that she holds dear, including her home planet, completely razed. In so doing, her cunning, ever determined enemies unleash a weapon so unexpected, so eerily familiar yet horrifically foreign that even Samus herself just might prefer the late Ridley or the SA-X...

Editing Team: Random_Dragon; ToxiClay

The Metroid Timeline/Chronology (confirmed by Nintendo) can be found here.

Canon Considerations
MLP-FiM: Up to AND including "Magical Mystery Cure." (Seasons 1, 2, and 3)
Metroid Series: Everything up to AND including Metroid Fusion (Including original mangas. See official timeline above). So, effectively everything.

Luna was having a pretty average evening: Some time with her sister, a brief check into a few dreams, eating some hay enchiladas and going off to bed herself.

So why did her lamp start talking all of a sudden? And why is her lamp suddenly retarded?

Avengers: Age of Ultron crossover.

Ultron’s plan had come to perfect fruition. There would be no more war, no more chaos, because the ones who caused it all would be gone. In just a short moment, the world would be saved from its true demon. Humans.

It would have all been so much simpler…if it wasn’t for them.

The Avengers.

As it is said, as it always will be, true peace can only be granted through countless innocent lives. In hindsight, the ponies were never that different from humans. Ultron’s plan is not yet over, and soon his strings will be severed…for the last time.

Big shoutout to Shrekzilla for his amazing job on the artwork!
Sequel: This War of Ours