When the evil, cat-like Catrina attempts to enslave the Little Ponies of Paradise Estates to create a Witch weed potion that will grant her control of the weather, it's up to Sundance and Baby Moondancer to save the day! There's already so much to do before the costume ball! With the help of their human friend, Megan, can Sundance and Baby Moondancer rescue the other Little Ponies in time?