I made a boss theme where Twilight Sparkle, Delta Brony, and Megan battle Princess Dark Matter. I included Dancing On Air, which is Megan and Firefly's song. The ponies must distract her while Megan gets ready to use the rainbow of light. The rest of the Mane Six are hoping to get their cutie marks back.
Haylizabeth as Twilight Sparkle
donniegirl12 as Megan
Rina-Chan(MeleePrincess) as Princess Dark Matter
GloryOfTheWings as Applejack