Malcolm and his folks realize his scholarships will still leave them five-thousand dollars short for his Harvard tuition. Hal promises he'll find the extra money somehow.
Malcolm organizes the outcast kids at school for an anti-prom; Reese is transformed into the perfect prom date... for a price; and Dewey holds Hal's wallet hostage for the attention he was denied as a child.
Reese pretends to be a vegetarian; Hal decides to teach Dewey a lesson about the game of "Life"; and Malcolm talks Craig into standing up to Lois... and then regrets it.
Malcolm's afraid to visit his best friend Stevie in the hospital; Reese becomes a master telemarketer; and someone secretly tries to drive Lois crazy.
A dance competition teaches Malcolm that beauty is in the eye of the beholder; Lois is determined to outlast her competition for a new truck; and Hal discovers a dream bachelor pad buried in the back yard.
Hal feels betrayed when his friend Trey charges $2,000 to fix Hal's teeth; Malcolm and Dewey find a new mattress; and Reese teaches Lois how to ride a bike.
After Reese is severely humiliated by four girls at school, Lois exacts revenge on them; and Hal builds a pitching machine while hiding out from Lois in the garage.
Hal and Lois accompany Francis to his 1-year AA "birthday" party; left home alone, Malcolm, Reese, and Dewey argue about where to go when Dewey finds the spare key to Hal's car.
After Hal's father dies, he refuses to grieve but indulges his sons, hoping they'll remember him more fondly than he does his father.
When Lois and Malcolm are sidelined with mononucleosis, they're forced to share a bedroom; Hal gets to know his neighbors; and Dewey gives Reese lessons in how to manage Jamie as a slave.
When Malcolm dodges advances from college recruiters, Hal is happy to be wooed instead; Reese flourishes in his new marriage, but misses a big warning sign; and Dewey learns just how poor Francis is.
While Lois and Hal accompany Dewey on a mishap-plagued trip to a piano competition, Ida brings a girl from her home country to stay with Malcolm and Reese... and engages Reese in a competition to win the girl's hand in marriage.
While Malcolm battles a yearbook photographer to get a good photo, Hal, Lois, and Dewey intercept a scholarship check addressed to Malcolm and try to rationalize spending the money; Reese goes back to work delivering meat.
To preserve an academic title he once won, Herkabe tries to get Malcolm to sabotage his grade point average; a clingy neighbor attaches herself to Lois; and Hal gives Dewey romantic advice.
When Reese's female army buddy comes to visit, Reese struggles to understand his attraction to someone he considers his best friend; Hal becomes jealous of Lois' orthotic shoe inserts; and Dewey gets even with Malcolm for an unpaid debt.
During a blackout, events are seen from three different perspectives: Reese cooks steaks for Hal; Malcolm tries to sneak three Dutch girls into the house; and Francis tries to steal a stuffed fish.
Lois imagines having girls. Jennette McCurdy guest stars.
Hal hits the jackpot. Or does he?
Malcolm's good at art, but his classmate is only good at pranks.
What's behind the "forbidden" door? There's only one way to find out.
Nothing could make Dewey give up his teddy bear. Well, nothing except this.
Malcolm expected to be punished, but are Lois and Hal letting him off the hook?
Jennette McCurdy guest stars in the episode where Dewey's class goes too far.
Where are all the bugs coming from? Hal's about to find out.
After the cute babysitter gives Dewey a bath, Malcolm and Reese take action.
Inventive half-hour comedy about a middle-class family seen through the eyes of Malcolm, a regular kid with a genius IQ.