Mr. Hyde

Mr. Hyde (voiced by Lenoard Nimoy) is Dr. Jekyll's alter ego and (according to rtgoh2) the main villain of Jaden meets the Pagemaster. After Dr. Jekyll drank his potion, he became the monstrous form that is Mr. Hyde. He uncontrollably tried to kill Richard, Jaden, and the others, but fell down a hole of the mansion floor.

Trivia

 * Mr. Hyde might return in the series.