ANYWAY, it's about small woodland animals whose forest home suffers a gas leak (IN HARLAN KANSAS??), and after being separated from their families/loved ones a bunch of the animals end up on this quest through uncharted lands because they have to go find an obscure plant that holds the key to saving them all.
I absolutely can't think about Dean and Castiel going to Purgatory to find the Michael Flower without assuming this mission plays out exactly as Once Upon a Story does. (Basically, Dean and Castiel need to meet an avian gospel choir, be terrorized by construction equipment, and build an elaborate flying machine out of sticks and leaves in order to get to the flower they need.)
IT'S AN ADVENTUROUS RACE AGAINST TIME. Dean can be Russell (the hedgehog) and Castiel can be Abigail (the mouse) and Edgar (the mole), because in Heaven Castiel has six wings and four faces, two of which are woodland animals from Once Upon a Forest.