The Cutie Mark Crusaders thought weather to be engineered by pegasi, wind and rain only occur on schedule. That there might be more to it than this age old believe they only find out when they get caught in an unscheduled storm themselves. By chance they get saved by a young pegasus, but he is hurt in the process.
While he recovers from his wounds in Ponyville, danger approaches as ancient spirits awake.
It is up to the Mane Six and the Crusaders to save the day. Can a certain gray maned pegasus help? Or will his secrets lead to death and destruction?