Zummi finds a section in the Great Book of Gummi dealing with advanced magic and, fueled partly by Gruffi's not taking his skill seriously, unlocks it. But it alerts an evil wizard imprisoned by the Ancient Gummis, Zorlock, to the fact that a great deal of power has been unleashed, and he's determined to free himself so sends his transformed pet to steal it, also dragging Zummi underground. The others follow him and, after a cave-in, the oldest three go to reclaim the Great Book and stop Zorlock from getting Zummi's Great Gummi medallion to unlock it and begin a reign of terror. Written by
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And so's the great book.
References For Whom the Bell Tolls