Young Mary Katherine (M.K.) returns to her eccentric scientist father's home, but his all-consuming quest to discover a tiny civilization in the neighboring forest drives them apart. However, M.K. soon finds herself shrunken down by Queen Tara of that forest who was mortally wounded by the putrefying Boggans, and charged to deliver a pod bearing the new Queen to safety. Together with a veteran Leafman warrior, two goofy mollusks and a young maverick, M.K. agrees to help. As the villainous Boggan leader, Mandrake closes in, M.K. and her new friends must draw on the best of themselves together and discover what they have to save their world..
James V. Hart (screenplay), William Joyce (screenplay), Daniel Shere (screenplay), Tom J. Astle (screenplay), Matt Ember (screenplay), William Joyce (story), James V. Hart (story), Chris Wedge (story), William Joyce (Leafmen characters from book "The Leaf Men and the Brave Good Bugs")