When Lizzie accidentally starts a mean rumor about Kate, Miranda stands up for her friend and takes the blame. Unfortunately, she has to deal with the fallout of ticking off the school's new head cheerleader.

Lizzie's mom makes Lizzie wear a unicorn sweater to school picture day, that Lizzie does not like. Gordo wants to do a tough pose for his picture. Miranda wears the same outfit as Kate to get pictures. Matt has an unstudied test so he decides to fake sick.

Lizzie is happy to be on her way to a school camping trip, but is unhappy when she finds out that her mom is a chaperone. Will her mom embarrass her to death? With Jo gone, Sam and Matt are left home alone trying to figure out what to cook for dinner

When Lizzie is not allowed to go to a Pool Party thrown by Danny Kessler, due to Grandma McGuire's birthday, Miranda becomes friends with Kate.

In an effort to prove she is really good at something, Lizzie trains for rhythmic gymnastics.

Convinced that Mr. Pettus is unwilling to give him a fair grade, Gordo switches science projects with Lizzie.

Aaron Carter is in town shooting a music video. Miranda, Gordo, and Lizzie sneak past guards to meet Aaron Carter. Unfortunately, they did not know Lizzie's Dad had bought them passes to get to the shoot with no trouble.

Lizzie tries to prove to her parents that she is responsible enough to babysit Matt.

When students have to choose between Larry Tudgeman and Claire Miller for class president, Lizzie decides to run for office. Although, she finds that gaining the favor of all her classmates won't be easy; Matt gets an imaginary friend, and Lizzie uses this to her advantage to tease her little brother.

Lizzie's social studies class is paired off for a class assignment, where they have to pretend to be married and return for a school reunion. Lizzie, a little put out that Miranda got Ethan instead of her, neglects Gordo as her husband.

Lizzie becomes friends with a bad girl and develops bad habits and a bad personality. Miranda and Gordo are concerned with this and decide to help Lizzie become her old self. Matt is given the freedom to stay up late at night, but after initial euphoria, he starts having problems with staying awake during the daytime. Miranda and Gordo create a short video to convince Lizzie to be good again.

Lizzie and Miranda go shopping for their first bras with Lizzie's mom embarrassing them along the way. Meanwhile, Matt asks for Gordo's help to direct a martial arts film to enter in a contest.

In order to stand out of the crowd, Gordo sports a 1960s attire (including a Sinatra fedora) and starts listening to the Rat Pack. But he is disappointed when the trend catches on with the whole school, including Lizzie and Miranda. Matt and Lanny try their hand at creating a record in order to get their names featured in the Guinness World Records

Lizzie gives Miranda a bad review when she plays the lead role in the school play. Miranda soon realizes that singing is her main talent, rather than acting. Matt and Lanny want a pair of walkie-talkies, but Matt's parents refuse to pay for it. So Matt sells everything he owns, including his bed and clothes, to get the money.

Lizzie is in a frenzy because Ethan has asked her to sit with him at lunch the next day. Matt accidentally boards the wrong school bus and spends a day at Lizzie's school, where Lizzie has a harrowing time when everyone is besotted with Matt, including Ethan.

Lizzie becomes obsessed with volunteering after a school volunteer project. Meanwhile, Gordo becomes obsessed with winning the Science Olympics, and Matt goes power crazy with his new hall monitor job.

Lizzie has to attend a class charity drive and looks forward to spend the whole day with Ethan. At home, Matt irritates Lizzie with his magic tricks and he handcuffs himself to Lizzie and loses the key. Meanwhile, Jo finds the key and decides to remain silent about it so that Lizzie and Matt learn a lesson about family bonding, getting along, and looking out for each other. Lizzie has a hard time keeping Matt hidden from Ethan for the whole day leading to embarrassing situations.

Lizzie and her friends lie at their homes and sneak off to see an R-rated movie that everyone else at school has seen. While at the movie theater, Lizzie saves a man who is choking on a candy ball and gets interviewed by a TV crew. Lizzie's parents come to know of it and Lizzie gets busted. Meanwhile, Matt is having a fair at school and Jo decides to build a velcro-wall in which kids can jump onto.

Lizzie and Miranda feel neglected, when Gordo spends more time with his new girlfriend, Brooke (Kyla Pratt). They are unable to come to terms with the fact that Gordo has a girlfriend now and he is drifting away from their group. Meanwhile, Matt learns about "percentages" from his father and starts accepting bets from his friends, but he eventually lands in trouble when his mother finds out about this.

Gordo becomes Ethan's math tutor because he needs the money to buy a new stereo. However, once Lizzie shows Ethan an easier way to do math, he decides he wants Lizzie as his tutor, and not Gordo. Meanwhile at home, Matt and his friend Oscar try to emulate superheroes by trying to help people. But their noble intentions are not well received by people around them as they unknowingly cause harm to them.

Ethan invites Lizzie, Gordo and Miranda for bowling, while on the same day Lizzie's dad wants to spend some quality father-daughter time with her. Meanwhile, Matt and Lanny plan on what they can do to stop the bully, Heywood Biggs, from ripping on them.

A big-time movie director offers to follow Gordo around to see a day in the life of a regular kid. Gordo starts saying rude things to the camera, though, and even coaxes Lizzie and Miranda to tell each other's secrets in front of the camera during which it is revealed that Lizzie had a crush on Gordo in the 4th Grade. Meanwhile, Matt gets blamed for all the troubles created by Melina and he admires her qualities as a troublemaker.

Lizzie is selected as a model to participate in a fashion show presented by Teen Attitude magazine at a local mall. Her modeling stint earns her fame in the school but she is annoyed when everyone starts treating her differently because of her new status. Meanwhile, Matt and Lanny buy a hammock from a shop but when it turns out to be defective, the shopkeeper refuses to take it back and give them a refund. Matt and Lanny then decide to teach him a lesson.

Lizzie wants to become the "Dungeon mistress" for the 7th grade Halloween fright night at school. However, Kate becomes the dungeon mistress and Lizzie is forced to become a clown. Peeved by this, Lizzie, Gordo, Miranda along with Matt devise a plan to embarrass and humiliate Kate in front of the whole school.

Hoping to win a trip to Miami, Florida, Lizzie, Miranda and Gordo team up to enter the school's "Fact-athlon" contest. Mr. Digg coaches them for the quiz in an unconventional way but they eventually end up losing. Matt and Lanny hire a drummer and start their own rock band, but in the end they call it quits.

Lizzie discovers that Larry Tudgeman has a romantic crush on her and when he asks her out, she reluctantly agrees to go out with him. Surprisingly, Lizzie enjoys the date, but eventually in the end, they part ways. Meanwhile, while cleaning up some junk, Matt and Sam find an old Soap-Box Derby racer and decide to restore it.

Gordo becomes obsessed with a Dungeons & Dragons type board game which was gifted to Lizzie by her grandmother. His obsession causes his grades to drop and Lizzie and Miranda take the help of Matt to bring Gordo back to his senses. Meanwhile, Matt has to observe wildlife for school project but eventually, Sam and Miranda's father end up climbing a tree and watching a bird's nest.

After being absent from school, Lizzie finds out that her project partner is none other than Kate Sanders, who was also absent on the same day. After their initial hostility, they both start getting along together. But after the project is over, they both take potshots at each other but not before sharing a secret smile and realizing that they still have a bond between them. Meanwhile, Matt is convinced that he has psychic powers and has a hard time convincing his mother about it.

Miranda is romantically smitten with a boy in her class, but is too nervous to talk to him. So, Lizzie decides to help her out. A misunderstanding leads the boy to believe that Lizzie has a romantic crush on him. Gordo is sick of listening to all the girl-talk between Lizzie and Miranda and decides to indulge in some male bonding with Matt.

Gordo installs video cameras all around the school, revealing embarrassing secrets about the students. Further, he plans to enter his film into the district film competition. Miranda gets upset on hearing this as the film showed her in bad light. However, Gordo pleases all when he showcases the film without revealing anyone's identity. Meanwhile, Matt decides to become a stuntman and tries out various stunts.

Gordo feels self conscious when he sees Ethan Craft and Larry Tudgeman growing up sooner than he is. He tries to be "manly" by trying to do manly things but in the end he decides to have a Bar Mitzvah which would initiate him into adult life. Meanwhile, Jo becomes fed up with her husband not taking things seriously when Matt misbehaves and goes on strike forcing Sam to deal with their son's behavior.