The Elements of Harmony didn't work. Nightmare Moon won. Her beautiful night has been unending for over two years now, and her reign over Equestria is total.

Twilight and Pinkie Pie never gave up, even after everyone else did.

An infinity of praise be to Harwick for the cover art.

This story is a sequel to Cheer Princess

Princess Celestia followed Sunset Shimmer through the mirror portal and became stranded in another world. Without her, Princess Cadance was the only pony left capable of moving the sun and the moon.

With the help of Zecora, Cadance learned to move the heavens, but as she brought about night for the first time, she accidentally released Nightmare Moon from her prison.

Now, with the assistance of Princess Cadance, Nightmare Moon rules Equestria. As the search for Princess Celestia continues, Cadance strives to reach the heart of Princess Luna, to restore her to the gentle and kind mare she once was, while Nightmare Moon learns what it truly means to rule a kingdom.

The planet of Chikyu is pretty odd, from an outsider perspective. There are anthromorphic sapients of every stripe and sort, the world president is a dog, its greatest warriors are alien monkeys, the average IQ (outside genius scientists or children) is somewhere below 50, and magic orbs raise the dead. How much difference would adding a pony that barely talks really make?
...quite a lot, apparently. Just ask Mr. Popo...if you dare.
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Dragon Ball Z Abridged crossover
Edit: Cover art by CaioCoia.
On DA: https://www.deviantart.com/caiocoia

Unhappy that her future as a member of the monarchy is denied by Celestia, Sunset Shimmer escapes through Starswirl's mirror into another world, planning to take it over to prove once and for all she was fit to rule. What she didn't expect—besides a species change—was to arrive in a world already conquered.

TvTropes Page (Just created! Needs Help!)

Art (Will contain spoilers)

Sunset Shimmer - Bloody Sunset

Spoilers Ch. 11+: Angel - Angel and Sunny
Spoilers Ch. 18+: Princess - Comic
Spoilers Ch. 121+: Alejandra Acevedo - Flying at the speed of death
Spoilers Ch. 161+: Apple Bloom - Bloom
Spoilers Ch. 180+: Food - Sunset's Party Dress
Spoilers Ch. 185+: Fugue - Fugue by Rametep
Spoilers Ch. 197+: Exhausted

(Art is always welcome!)

WARNING: CONTAINS SPOILERS FOR THE WHOLE STORY: TIMELINE

Spike the dog approaches Sunset Shimmer with an important question. A question she simply must find the answer to for the sake of Equestria's future.

Part of the MAD verse.

Thanks to Nova Quill/Firimil, and
Steel Resolve for their edits and suggestions!

Wonderfully serene picture by fizzy-dog!

Twilight Sparkle invites a bunch of her friends over to a slumber party… No, not that group of friends… The ones who’ve maybe dabbled in some light conquering or wholesale destruction of planets.

Part of the MAD verse.

Thanks to Tired Old Man, Nova Quill/Firimil, and
Steel Resolvefor their edits and suggestions and xxMarkingxx for the adorable picture!

Starlight and Trixie go to the store to buy groceries. A task so mundane there’s pretty much no way they can mess it up.

Note: Part of my “Twilight, Spike, Starlight, Trixie, Tempest Shadow, and Grubber all hang out at Twilight’s Castle continuity” which I should maybe think up a name for… 3TsG2Ss? It’s Always Sunny in Ponnyville?

Thanks to
Tired Old Man,
Nova Quill/Firimil, and
Steel Resolvefor their edits and suggestions and cloudyglow for the adorbs vector!

This story is a sequel to The Iron Horse: Everything's Better With Robots!

Turing Test is a robot pony. She's also Equestria's Minister of Technology (it's a long story). She wants to bring ponies into the modern world, but it's an uphill battle against years of technophobia and prejudice among the Canterlot bureaucrats. But then she learns of the untold advanced technology in the world of humans and sets off on the ultimate field trip. Canterlot High just got a new exchange student...

Editors: Reese, GenerousGhibli, E3gner
Illustrations: Greenfinger