17 year old Mary Katherine, or M.K., moves in with her eccentric scientist father Professor Bomba, who has been searching for tiny humanoid soldiers called Leafmen. They protect the forest that Bomba lives near from wicked creatures called Boggans and their malevolent leader Mandrake. An independent young soldier named Nod decides to quit, much to the ire of the no-nonsense Leafmen leader Ronin.