The Gingerbread Pony

In the dead of night a young girl is awakened from her slumber by a tap on her window. Outside stands a living gingerbread pony. The pony has been sent by the fairies in Fairy Land on an urgent mission to bring our heroine back to Fairy Land to help them with a dire emergency. A great giant on the Troll Land side of the great jellybean wall separating both kingdoms is systematically eating the jellybean wall. If something is not done soon, the wall will fall and all the Trolls will invade Fairy Land. Lisa, our heroine, comes up with the plan to save the wall, but can she accomplish her mission before the wall falls?