Francis decides to surprise the family by coming home, but he catches Jamie off-guard and ends up knocking the lights out in the house. Meanwhile, it's Lois who's in the dark when Hal decides to cancel their anniversary dinner and forces Reese to cook them a romantic feast at home, and Malcolm who ends up in hot water when he sneaks three Swedish girls into the house.
Malcolm is a regular high school kid trying to navigate his way through life despite the various obstacles thrown in his way a complete misunderstanding of girls, the constant burden of masterminding plans to get himself and his brothers into or out of trouble, and a miserable job at the Lucky Aide not to mention a severe case of teen angst.
Although Malcolm has a genius IQ, he can't seem to make sense of the opposite sex, much less his embarrassing family. Lois is the outspoken, opinionated mom, who still manages to rule the roost even though her boys are growing wise to her crafty ways. Hal, a dad who is just a bumbling, big kid at heart, often finds himself creating more chaos than his five boys combined.