Rick and Morty enter a world most grim...a world of fairy tales! When Morty has to cram for a test, Rick suggests using his latest invention to absorb all of the knowledge he needs from his textbook Avalonia: Bad Stories for Bad Children. Things go wonderfully wrong when RIck and Morty are both pulled into the universe contained within the book, setting off on an adventure through a twisted mirror version of Grimm's Fairy Tales.