The half-hour show takes place in Ottawa, Ontario, and revolves around the everyday happenings of the Spencer family, more frequently Kevin himself. His parents are Anastasia and Percy Spencer. Anastasia (voiced by Thomasin Langlands) is a fat, drunken, and promiscuous woman, a curious cross, it would seem, between a hoser (a stereotypical Canadian) and a hick. Curiously, she often ends up having sex, despite being immensely unattractive in just about all senses of the word. Often she receives sex because of people wishing to get back at her husband, Percy. Percy (voiced by Lawrence) is also a fat, drunken, loud, boorish and illiterate oaf, so stupid it is questionable whether he can write his own name. With parents like these, it is not the least bit surprising that Kevin is a "chain-smoking, alcoholic, sociopathic" juvenile delinquent at the age of 14.
Most of the adventures on the show revolve along illegal schemes committed by any or all three of the characters. Most of the time their motive is nothing more than the ability to acquire more money than their welfare cheques give them. Kevin occasionally goes to school, encountering other stereotypes and people who are almost as stupid as his parents.
Kevin's character is slightly more interesting in the fact that he is obviously in possession of some degree of intellect. The show never uses his voice (until recently), but suggests that he tells people rather detailed and articulate things or asks intelligent, legitimate questions when faced with an argument. Instead, the show's narrator (voiced by Lawrence) speaks for him. More often than not these arguments are dismissed by the person that hears them, and this usually causes Kevin to respond to what his environment led him to be the answer: violence.
Another frequent character in the show is Allen the Magic Goose, an anthropomorphic chain-smoking goose that is the other inspiration behind many of Kevin's misadventures, but is just a figment of his imagination. The bird is what contributes the most to Kevin's sociopathic nature, usually asking him to do illegal, indecent, and dangerous things simply for the sake of the thrill or for vengeance.
Sum 41 & Treble Charger voice animated versions of themselves as they get caught up in a sordid misadventure with Canada's most dysfunctional family. In the episode, Kevin Spencer wins a contest from a music television station to spend a day with famed Canadian band Treble Charger. When the day comes, Kevin realizes that the band isn't living up to his opinion of what rock stars should be and initiates the band into a booze and drug-fueled bender. Meanwhile, Kevin's idiot father sets out to kill the members of the band Chilliwack while Kevin's sleazy mother sets her lusty eyes on the Treble Charger dudes with a whacked-out child support scheme. Later, during a radio interview, Kevin pits Treble Charger against fellow Canadian rockers Sum 41. When anger mounts between the bands, both come close to losing their careers in a degenerative spiral of booze and alcohol addictions. It all comes to a head at the Juno Awards, where the two bands are scheduled to share the stage.
A teenager comes-a-knocking on The Spencers' door and tells Percy he's his son. Percy denies it at first but figures it'll be a good change from Kevin. Angered and left out, Kevin makes homemade Absinth while his parents spend time with their new son.
The folks get a free television as part of a court settlement. After some channel surfing, they discover it came with amateur porn which is clearly stolen of course.
Percy trains Kevin to be a terrorist. Things go terribly wrong when a bomb explodes in a basement and Kevin has a ski pole stuck in his stomach from one end to another. The fuzz overhear this and the family's on the run.
Kevin is placed under house arrest. To lighten up the mood, his dumbass parents attempt to cheer him up by playing board games like Monotony. Kevin gets inspired by this and invents his own game. 15 years ago, Percy finked the Leduc brothers. 15 years has passed and they vow to get revenge on Percy.
Anastasia wants to divorce Percy suspecting he has two-timed her so she must display evidence he actually cheated on her. So Kevin tells his mom to hire Afroman to bust Percy.
The Spencer's become heroes when they attempt to thwart a bank robbery.
Percy runs for Premier so he can have booze sold in corner stores like in Quebec.
Kevin embarks on a journey after awakening from a dream telling him he has to see something.
Sponsored by Annoy-o-Rama, they've issued the viewers to try to last half an hour through all the annoying situations.
In this must watch episode, Kevin learns his uncle Lester might be his actual father.
Percy, with Kevin join a demolition derby circuit. Anastasia goes berserk when the phone doesn't stop ringing and demands Percy to answer the phone without realizing he's joined the derby.