Set between MLP:FiM Season 3 and 4.

Sonic, Tails, and Knuckles find themselves against Dr. Eggman once again, the scientist wanting to use the Chaos Emeralds for an unknown plan.

Unfortunately, the plan involved sending the trio to another world, which he plans to conquer as well as seek what are known as the Elements of Harmony. The fate of Equestria hangs in the balance as the heroes of both worlds must join forces against Eggman's robot army.

Can Team Sonic and the Elements foil Eggman’s latest scheme or will they fail?