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Dewey is a fictional character from Malcolm in the Middle. He is played by Erik Per Sullivan.

Dewey is portrayed as quieter and more inclined to the arts than his brothers and until Jamie was born, was the youngest of the four. It was noted in one episode that Dewey was exposed to radiation from a cracked microwave while in the womb. He hides his intellect from Malcolm and Reese, in many cases cleverly taking advantage of them. In one episode he fools Reese into believing he is forwarding instructions from their mother when in fact he is making them up while talking to a telemarketer, Francis, a time and temperature lady, or even no one on the phone ("Hal's Friend"). From then on, most episodes involving Dewey would have him viewed as a manipulator when dealing with his brothers or parents. Examples of this are the episode Stevie in the Hospital, when he made Lois think she was losing her mind by messing with her clothes and daily routine, and in Dewey's Opera, when he fueled a fight between Lois and Hal so he would have better material for the opera he was writing based on their fight. In the fourth season, Dewey begins to exhibit a high degree of intelligence, seen mainly in his talent of playing the piano. Dewey is about to follow his brother into the gifted class, only to have Malcolm help him stay in normal classes. Malcolm has Reese complete Dewey's test, which accidentally gets Dewey thrown into the "Special" class, which is full of kids considered lost causes. Students in this class are known as the "Buseys". Dewey has since organized the class to want to be all they can be, and is teaching them standard lessons. He has been trying to show that they are just as capable as others, and has organized them to do things such as performing an opera he wrote based on his family. Unlike Malcolm, his parents intend for Dewey to be rich and happy later in life. He spends much effort making sure his brother Jamie doesn't feel neglected like he did.