I.Q.

A man dressed as a jester had rattled off many questions to each contestant. So far, neither had made a mistake. I.Q. is a student of the Glenbrook Academy in Mr. Pryce-Jones' 3rd grade class, and the doppelganger of the Brain. His first and only appearance so far was in The Return of the King.

He won against Brain in a medieval trivia game because Brain gave an answer from modern knowledge, instead of what people thought was correct in the Middle Ages.

It may have been his plan all along to let Brain answer first and mess up, to further humiliate and defeat Lakewood.

Physical appearance
I.Q. is a dog with a cream complexion. His eyes are always relaxed, possibly hinting at his intelligence. He also has several hairs in the same design as the Brain.

He wears the Glenbrook uniform with a white collared shirt, a dark blue tie, light blue V-neck shirt, and a medium blue jacket bearing the Glenbrook insignia.

Trivia

 * As "the Brain" is a nickname, so is "IQ". (His real name is unknown.)
 * The Brain is the part of the body that controls actions and creates thoughts, but IQ or "Intelligence Quotient", is a measure of brain power.
 * Brain called himself 'IQ' in their homemade movie in "Arthur Makes a Movie"