Rainbow Dash, Pinkie Pie, and Twilight Sparkle go somewhere in the Everfree Forest that they weren't suppose to.

Ponies begin turning into humans as one from our world suddenly appears in Equestria, all the while the Alicorn Princesses lose their power.

When Twilight Sparkle tries to save a life, she gets thrown onto the Fields of Justice, and her own could be on the line