He is very geeky and self-absorbed and in the rare event he is given actual powers, he can also be as bossy as Lois, albeit much less competent than her. He admits he likes his job to Hal, but also enjoys frustrating Lois by telling her that he's unemployed. He is the youngest child until the birth of Jamie, and often falls victim to his brothers' pranks. They end up reconciling and getting back together. Neighbors despise Lois and her boys and celebrate the weekends when they're gone. It is shown that Kitty is very overprotective of Stevie. Chris Eigeman as Lionel Herkabe, the second teacher of the Krelboyne class and a former Krelboyne himself. At the beginning of the series, he is attending military school in Alabama ,  run by the strict Commandant Spangler Daniel von Bargen. He is the only sibling that eventually breaks the cycle of abusing the younger sibling, which ends up with him acting like a normal, lovable brother towards Jamie.
Because his family is disrespectful towards Lois, he rarely mentions them and avoids his family. Isaac all play Krelboynes from Malcolm's class. She has a younger sister named Susan, who blames Lois for stealing Hal from her. Hal and Lois' fourth son. Stevie has difficulty breathing and is revealed in season 5 to have only one lung. Reese is better than Malcolm at devising plans, and is masterful at the rare things which can pin his drifting focus, such as driving, or when he's revealed to be a culinary prodigy , excelling at cooking and baking. She ardently adores Malcolm due to his intelligence. Hal and Lois' fifth son, born at the end of Season 4. His best friend is Stevie Kenarban. Merrin Dungey played two different, unrelated characters. Francis is seen less frequently after season 5, becoming an occasional recurring character and making only a small handful of appearances in Season 6 and the final Season 7. Hodges, the school principal season 7. Neighbors despise Lois and her boys and celebrate the weekends when they're gone. In the series finale, he graduates from high school and starts attending a prestigious college by both scholarship and working various jobs, specifically as a janitor at Harvard University. Lois is disliked by both Hal's wealthy family and her own parents. She is a good wife to Francis and helps him resolve troublesome situations. Malcolm is a genius with an IQ of and a photographic memory. Main[ edit ] Lois Jane Kaczmarek: Hayden Panettiere as Jessica, a girl hired to babysit Reese, Malcolm, and Dewey who later ends up living on their couch temporarily after her dad is arrested. In the series finale, he and Jamie are seen hiding in the closet together after a prank. He is shown to being the only child who is capable of defeating Lois. In the series finale, he discovered that he and Lois are expecting a sixth child. Other characters[ edit ] Craig Lamar Traylor as Stevie Kenarban, Malcolm's best friend since childhood who's in the Krelboyne class and is in a wheelchair. Although a juvenile delinquent, he is street-smart. Kenneth Mars as Otto Mannkusser, Francis' boss who owns the ranch he works at after he leaves Alaska. Hal's best friend is Abe Kenarban.
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