Sonic Rainboom: Chaos Within Harmony

After major events in their respective worlds, the seven Chaos Emeralds and the six Elements of Harmony collide and cause both Sonic's world and Equestria to go on a collision course! It falls to two speedy blue heroes on the ground and the sky- as well as all their friends- to fix things! But can they do it before both of their worlds are destroyed in the chaos? Piece of cake!