It's Hal's birthday and Lois has Francis come home to celebrate it with the family as a surprise. The surprise is on her and the rest of the family as Francis comes home with a wife he married in Alaska named Piama.

Hal has finally made a deal with Ed for the boys to have their own computer. Unfortunately, it doesn't come without favors. They find out that Ed is a philanderer and has a ton of undeleted e-mails from the women in their neighborhood to prove it. Reese sees this as an opportunity to blackmail him to his own twisted scheme. Then, Hal decides to coach Dewey's losing team into better soccer players. Meanwhile, Piama is fed up with Lavernia mistreating Francis, and decides to make her pay for it. She steals her precious parakeet and holds it hostage until Lavernia treats her husband better.

Hal has his friends over to his house for their poker game, and tries to impress them in the process. Reese convinces two girls that Stevie has a fatal illness. Malcolm discover something dangerous in the house. Dewey has no place to go.

Malcolm and the rest of the Krelboynes are forced to re-join the rest of the school with disastrous results. Dewey is stuck at home with chicken pox and builds a dominoes masterpiece, which Hal wants to knock down.

Craig hires an evil helper monkey. Reese catches a burglar and decides that he would like to try being in law enforcement. Francis and Piama are forced to leave Alaska.

The family goes to the zoo. Malcolm is going through a crisis, and he and Dewey find themselves in a unfortunate situation. Reese angers an animal at the zoo. Hal is jealous of a former flame of Lois's who works at the zoo.

Malcolm and his family goes to Hals father's house for a reunion. The family doesn't like Lois. Reese and Dewey try to get in their grandfathers will. Malcolm's grandfather takes a special interest in him, while the young cousins love Francis.

Malcolm stops thinking in order to go out with a very dumb girl. Hal wins some money, and rents a steamroller.

Malcolm is fed up with the fact that every time he complains, something wrong happens. He has recently got kicked off the basketball team and vows not to complain anymore. He receives good results by not complaining - he gets back on the team, negates Lois' anger by not talking back to her, and gains the respect of his girlfriend, Nicki, who shares a kiss with him. Next, Hal decides to be a speed waker and soon gets competitive with a local walker. Meanwhile, Reese wants to take Alison to a concert and the only driver he can find is Craig Feldspar. However, Craig has plans of his own for his two passengers - a hay ride and a bonfire dinner. Alison is fed up and pepper sprays him and threatens to give Reese the same treatment if he doesn't let her go her own way. He's pissed off as Craig plays his ukulele and sings a song from Air Supply.

On a visit to Francis' dude ranch Hal can't help being disappointed in Francis' success, Reese and Malcolm fear Francis has turned into an overly responsible grownup, and Gretchen punishes Dewey for breaking a valuable doll.

When Lois' mother visits, she trips on a leaf and decides to sue Hal and Lois...just as Lois finds out she's pregnant again.

Malcolm competes in an academic octathlon but hates the intensity of the other competitors; Hal fights to regain Dewey's love; Reese tries to get out of going to a formal dance; Francis and Piama's argument over chores proves highly contagious to other couples.

Malcolm meets a chess-playing bum who could be him in 30 years; Lois can't figure out why she's gaining weight; Dewey attributes his bizarre behavior to obeying requests from the fetus Lois is carrying; Francis objects to Piama posing nude in an art class.

Hal takes the boys to a bridal show; Lois' mother wants to move in with the family; Malcolm gets an offer to enroll in a prestigious private school.

Lois continues with her strenuous labor, as friends and family all panic around her.

The family travels to Las Vegas when Hal experiences a dream about hitting the jackpot; Dewey and Reese enter an enormously obese rabbit in a contest; Lois gets to meet her favorite singer backstage; Otto and Francis get trapped in a well.

It's another family Thanksgiving, as Reese cons Hal and Dewey into helping him out with the cooking. Francis and Piama are also there, but they're not even speaking to each other. Lois tries to intervene, but it goes nowhere, as Hal prevents her from intervening. Soon after, all the family members start arguing with each other, claiming that this is the worst Thanksgiving ever. Meanwhile, Kirsten has invited Malcolm to her house party. He's having a blast without his family dragging him down and calls it the best Thanksgiving he's ever had in his life.

Malcolm's teacher forces him to secretly record Reese as he divulges his innermost secrets; Francis strikes back after a critic writes a scathing review about the hotel; Dewey starts his own novelty act at an outdoor mall; Hal's bosses are placed under arrest.

Hal and the boys enter the season of goodwill in a competitive spirit when the local church starts to undercut them on Christmas tree prices.

Lois has a dispute with Hal and the boys' favorite restaurant; Malcolm clicks with his girlfriend's family to the point where he forgets about his girlfriend; and Francis gets an assistant who tends to his every whim.

Polly begins dating Abe and Craig; Malcolm refuses to believe in the power of Dewey's lucky shirt; the ranch hands make fun of Francis; and Lois takes the kids to a baseball convention.

Reese inadvertently perfects Malcolm and Stevie's science experiment, but can't remember how he did it; Dewey dreams up reasons for people to buy the candy he's selling door-to-door; and Francis aids a piglet.

When Reese's girlfriend Beth cheats on him with Malcolm, he runs away to join the army; Meanwhile, Hal is arrested for supposedly hatching out an entire criminal scheme at his job.

Hal's trial continues as the evidence pointing against him grows; Meanwhile, at training camp, Reese and his team are captured by enemies because of Reese.

Strapped for cash for the holidays, Hal and Lois decide that all Christmas gifts this year should be handmade. But when Hal sees the thoughtful, quality gifts the boys made, he feels bad about his shoddy attempt and panics.

Francis shows up for his 21st birthday anticipating Hal will come through on a promise to go on a motorcycle road trip; meanwhile, the boys are trapped in the house while a bully waits outside.

Francis has made it through a year of sobriety and he invites the family to his AA meeting, until Lois discovers that he has invited her there to place his problems on her.

Having been denied a very lucrative job in a software company, Malcolm accepts the vision his parents have for him. The first US president that will actually keep in mind the best interests of poor people like his own family.

Polly begins dating Abe and Craig; Malcolm refuses to believe in the power of Dewey's lucky shirt; the ranch hands make fun of Francis; and Lois takes the kids to a baseball convention.

It's Hal's birthday and Lois has Francis come home to celebrate it with the family as a surprise. The surprise is on her and the rest of the family as Francis comes home with a wife he married in Alaska named Piama.

Hal has finally made a deal with Ed for the boys to have their own computer. Unfortunately, it doesn't come without favors. They find out that Ed is a philanderer and has a ton of undeleted e-mails from the women in their neighborhood to prove it. Reese sees this as an opportunity to blackmail him to his own twisted scheme. Then, Hal decides to coach Dewey's losing team into better soccer players. Meanwhile, Piama is fed up with Lavernia mistreating Francis, and decides to make her pay for it. She steals her precious parakeet and holds it hostage until Lavernia treats her husband better.

Francis shows up for his 21st birthday anticipating Hal will come through on a promise to go on a motorcycle road trip; meanwhile, the boys are trapped in the house while a bully waits outside.

Lois continues with her strenuous labor, as friends and family all panic around her.

Craig hires an evil helper monkey. Reese catches a burglar and decides that he would like to try being in law enforcement. Francis and Piama are forced to leave Alaska.

The family goes to the zoo. Malcolm is going through a crisis, and he and Dewey find themselves in a unfortunate situation. Reese angers an animal at the zoo. Hal is jealous of a former flame of Lois's who works at the zoo.

Hal and the boys enter the season of goodwill in a competitive spirit when the local church starts to undercut them on Christmas tree prices.

Francis has made it through a year of sobriety and he invites the family to his AA meeting, until Lois discovers that he has invited her there to place his problems on her.

Hal has his friends over to his house for their poker game, and tries to impress them in the process. Reese convinces two girls that Stevie has a fatal illness. Malcolm discover something dangerous in the house. Dewey has no place to go.