While Mario was busy liberating the various kingdoms, Bowser kidnapped Princess Peach. As a part of her humiliation, the King of the Koopas dressed her up as a ponygirl, allowing her minions to parade her around his fortresses. Unfortunately for the hapless princess, one of the Thwomps at this particular castle didn't get the memo, and plans on pursuing its normal course of action in response to someone walking beneath it...