It was a boring Summer in South Park. Thanks to their friend, Butters, the Boys found themselves having the same dream about pastel-colored ponies and decide to try and find out why.

During a slumber party, the Boys are mysteriously transported into a magical world of friendship, peace, and anthropomorphic, pastel-colored ponies.

Will they find a reason why they've appeared in this world? Will they ever return home? And why are they ponies too? This is really strange...