Humfrey tells Gary to go and find the philter .
Seeking a spell that will restore the polluted river Swan Knee to a state of purity , guardian Gary Gargoyle finds himself face - to - face with the Magician Humfrey .
Magician Humfrey tells guardian to go and find the philter .
Seeking a spell that will restore the polluted river Swan Knee to a state of purity , guardian Gary Gargoyle finds himself face - to - face with the Magician Humfrey .