When Dewey's pet rabbit does good in a state contest, the family must travel to Las Vegas for the nationals. But Reese unknowingly sells the rabbit to a restaurant. Now it is up to Dewey (with a little help from a "choking" Reese) to try and save the rabbit

Hal and the boys offer to watch baby Jamie so an exhausted Lois can finally get some sleep. Hal leaves the boys in charge while he goes to the Lucky Aid to pick up more diapers. While the boys are watching Jamie, three beautiful teenage girls arrive and woo Malcolm, Reese and Stevie away for the night, leaving Dewey alone with the baby

No one wants to tell Stevie his parents are getting a divorce, until Reese spills the beans

Malcolm skips out on Thanksgiving to go to a party; Reese becomes abusive to Hal and Dewey as he attempts to prepare Thanksgiving dinner

Malcolm chooses Reese as his subject for an Abnormal Psychology mid-term project; Dewey earns some extra cash as a street performer

Malcolm gets a job working for Lois on the drugstore loading dock but is shocked to find that Lois smokes. She makes him promise not to tell, then turns her back on him and writes him up for a silly offense. Meanwhile, Dewey runs away to the Ranch to be with Francis because he says he is tired of Reese and Malcolm

Hal, Reese, Malcolm, and Dewey go into business selling Christmas trees, with the boys using some of their own money, but two priests send homeless people to their business, trying to sabotage their sale

Neighbors have the annual "The Wilkersons are gone" block party until they come home early. Reese and Dewey set up a plan to get money by letting Reese-tortured kids get revenge. Hal and Lois enter a kielbasa-eating contest and Malcolm unknowingly assists a robbery, but a surprising twist comes in the end

Malcolm alerts the A.C.L

Jamie's babysitter coerces Malcolm into doing a "small" task for her; Dewey finds a friend, only to lose him to Reese; Francis persuades Otto to confront an old adversary that once courted Gretchen

Malcolm gets his tongue pierced and needs to hide it for a month. While Lois' mother, Ida, comes and annouces that she will marry a rich Chinese Man that she met on a cruise. Malcolm gets complications when his tongue ring gets infected, rendering him unable to say "S's" and he discovers that Ida has been drugging her fiancé with opiates and mood enhancers

Malcolm is convinced to play Softball by Lois and ends up doing very badly at it due to Lois's hold on him. Meanwhile, Francis tries to pick fights with Lois, Reese tries to break Francis's record of collecting toilet seats from a local junkyard, and Hal accidentally applies to become a member of the CIA

Lois' younger sister, Susan, pays the family a visit and brings with her expensive gifts for the boys, biting remarks for Lois and a cold shoulder for Hal – whom she has never forgiven for dumping her for Lois. Lois and Susan's competitive relationship takes a turn for the worse when Susan gives Malcolm and Reese her prize '65 Mustang convertible. But when Lois discovers that Susan needs a kidney transplant, she puts her anger aside and offers to donate her kidney to Susan, which Susan only sees as the perfect opportunity for Lois to one-up her

Lois blows her top over a hidden 15 percent surcharge on the bill at her family's favorite pizza place and stages a boycott.but Hal and the boys are sneaking slices on the side. Malcolm meets Angela and becomes instantly smitten with her intellectual family

Francis is determined to show his parents why they should not have kicked Reese out. Meanwhile, Malcolm helps a football player write a college essay

Lois tags along with Malcolm as he visits a college, but she's determined to room in the dorm Malcolm is staying in when she learns the room is co-ed. Meanwhile, after his father denies him a piano, Dewey begins stealing objects from around the house to amuse himself and to drive Hal crazy. Reese meets a girl, who he thinks is a narc, and he pretends he is a dealer, unaware that she is really an undercover cop

Hal sets up Abe Kenarben on a blind date with Jaime's babysitter Polly but then realizes Lois has also set her up on a blind date - with Craig. Malcolm, Dewey (with his "lucky" shirt) and Reese also meet Reggie Jackson and Francis is embarrassed by Piama in front of his co-workers

Malcolm convinces Dewey to do poorly on an I.Q. test, so that he won't become a ridiculed Krelboyne student

When Dewey's annual candy selling event for school comes up, he uses the excuse of "these bars help support america" to sell them. Malcolm and Stevie attempt a science experiment, and are shocked when Reese begs to help

When Lois tracks down her father's "other family," she meets Victor's "other wife" Sylvia, and learns something shocking about her dad

Reese's new girlfriend Beth is about as dumb as he is. Malcolm initially dislikes her but they soon get to like each other too much and Beth breaks up with Reese. Devastated, Reese runs away and joins the army under the false surname

Reese continues to be a great soldier in the Army until he finds himself in a situation where his Sergeant cannot help. But after comparing being captured to being grounded, he takes action and leads his team to victory. But being such a successful soldier has it's bad parts as well, as Reese prepares to jump from the plane - right into Afghanistan