Mordecai and Rigby are just doing their job at the park when they find a portal. Of course, they take a peek, and find themselves in a land of magical talking ponies. Oh, and they turned into ponies too. They know that they need to get back to their own world as quickly as they can, or Benson will find them missing and fire them.

But duuuuuuuude, these ponies are cool!