Sonic the Hedgehog & My Little Pony: Harmonic Chaos: Mobequestrius Heroes; Rainbow Rock
Twilight, Spike, Sonic, Sally, Hope, and Sunset are called back to the Human World, with Emerl tagging along, in order to stop the joint forces of the Deadly Six, and 3 Sirens known as the Dazzlings, from feeding off the negative emotions produced by their music.
