Sonic, the CMCs, and Spike teams up with their new allies to get the emerald before Robotnik and Knuckles while the Rainbooms investigates the Dazzlings' latest scheme in Hoovaii.
After the two groups meet up due to circumstances, Sonic and the Equestria Girls must team up to defeat an evil genius, who wants to use his power for world domination, while on the run from the government lead by a special agent.
The fate of the world hangs in the balance and its potential savior is a mysterious figure known only as The Queen of Knives. But who is she? That's what Applejack has to find out.
Midsummer Night, a Mark-II Jaeger, finds itself in the inky depths of an unknown ocean after a botched brawl. Seems they may have got a bit more than they bargined for though...