It is said that deep underground in the center of a mighty labyrinth there lies a palace. Within this palace and guarded by a terrible beast there is said to be a mask containing untold power. Many have sought this mask. None have succeeded.

When a young earth pony, named Epona, claims her mentor is trapped in that very palace at the mercy of that very terrible beast, Daring Do agrees to help.

But can she succeed where all others have failed?