Awakening in a magical forest world, a teenage girl finds herself at the centre of a battle between good and evil in this CGI-animated fantasy adventure. Mary Katherine (voice of Amanda Seyfried) lives in a cabin in the woods with her eccentric father, Professor Bomba (Jason Sudeikis), who studies the local fauna. One day, when he doesn't return from a hike in the forest, she sets out to find him, inadvertently stumbling across some strange glowing leaves. Clutching one, Mary Katherine is shrunken down to the forest floor, where, after meeting up with a group of warriors known as the Leafmen, she finds herself helping her new friends in their war to save their world from the clutches of the evil Boggans.