William's enemies decide once and for all how to deal with the fact that William is still searching for his moped.  Meanwhile, our hero gets hungry and figures that, since he likes mushrooms on his pizza, that he will enjoy the mushrooms he finds on the ground-leading to an unforgettable experience for poor William.  Because of this though, he meets a potential ally that could be very helpful, as log as William helps his new gigantic friend win the love of his life.  And, in the end, something happens that may have disasterous implications for the future!