Char Gen and Xavier Priston are Equestria's best scientists. Even though they live in a world where magic is a fact of life, they are still greatly admired for their studies. Their discoveries have benefitted Equestria, as well as other regions. Everything is looking up for them. Until she came to their lives.

Glisten Vial was a mysterious mare. She walked into their laboratory, offering them money for their future projects. And to make sure that they said yes, she offered them the things that they greatly desired. The only thing she asked in return was for them to conduct some experienments for her.

What seemed like a great partnership, soon turned into a nightmare. One failed experiment created terrifying monsters, released all of their test subjects, and destroyed their laboratory. To make things even worse, each test subject and monster want revenge.

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Special thanks to everyone who donated their OC's. They shall be credited as the story progresses.

Big thanks to Doom Trot for helping me with this.

After a freak accident happened while saving their worlds, a blue hedgehog and a cyan, rainbow colored mane pegasus meet and find themselves in a new dimension called Earth! In order to survive in this world, they will have to work together to find their missing friends, as well as the Chaos Emeralds and the Elements of Harmony! And with the help of two human siblings Christopher and Katherine Thorndyke, AKA the Thorndyke siblings, they are in for one hell of a ride! However, troublemakers from their worlds such as the evil genius Dr. Eggman and the mad scientist pony Steam, are also here to cause trouble for our heroes! Who will come out on top with the Emeralds and the Elements? Find out in this exciting adventure in Sonic X: Friendship is Universal!

A/N: The MLP side is an adaptation to Super Writer's fan game Curse of The Lost Kingdom. All credit for the original characters and elements from the game goes to him.