Infernal Concoction

With the school year becoming more and more brutal at Cloud Tower, Icy turns an ancient potion into an energizing candy and sells it to her fellow classmates in order to test it. Her candies become the newest craze at the school and she and her sisters do everything they can to make a profit off of it. Soon enough, it is revealed that Icy's new candies are highly addictive and harmful, so the Winx take it upon themselves to get the candies banned for the good of the Cloud Tower witches.