Rainbow Dash is the first pony ever to accomplish a Sonic Rainboom, only thought to exist in legends. She even earned her cutie mark that day. But...

Applejack closed her window before witnessing the Rainboom that led her home.

Fluttershy was also scared away by the Sonic Rainboom and never comforted the animals.

Pinkie Pie went inside before witnessing the Rainboom that taught her what joy was.

The Rainboom wasn't powerful enough to split open the rock that was full of jewels causing Rarity to abandon it and return home.

Twilight gave up on hatching the egg at the entrance exam long before the Rainboom caused her magic surge.

But fate has a funny way of doing things. It bring the six mares together in adulthood, but their lives have been drastically different. Only one of them has ever earned their cutie mark.

When Nightmare Moon returns on the night of the Summer Sun Celebration, can these six mares find a way to be friends and wield the Elements of Harmony? Or will Nightmare Moon take control of Equestria because of the Mane 6's altered destiny?