At Elementary School, Rainbow Dash meets Fluttershy, who relays her the legend of the Sonic Rainboom. Supposedly a beautiful sight for all to behold, an event that influences many lives once it occurs. Dash wanted to be a part of it, or at least see one. And one day, she did manage to get a view of it.

Unfortunately, she was the only one who did.

A certain boastful mare returns to Ponyville, this time lurking on the shadows of the night, what will the Great and Powerful bring to this peaceful county this time around?