Each of the Mane 6 wakes up in the bodies of stallions, but with their original minds unchanged. Everyone around them seems to think they were always this way. Rapidly dysphoria overtakes them, and they try to become their old selves once again, to the confusion and even horror of many of their loved ones.
The mane 6 must fight to reclaim their bodies while piecing together the mystery of what happened to them and why.