A dimensional intrusion by an egg-shaped "human" inventor brings the ponies together with a blue hedgehog and his friends, as Discord unleashes chaos in the form a world made of their 2 worlds and other related worlds as well.

Superheroes in a human world's version of Earth try to magically remove the remainders of a supervillain gang they had spent a year dealing with. But if The Sorcerer's Apprentice was any indication of how successful big plans can be...