Gordo is sure that Mr. Pettus is giving him ""B""s instead of ""A""s because Pettus doesn't like him. His state of mind isn't helped any when the teacher gives the class an aptitude test which shows that Gordo is best suited to be a blackjack dealer. To prove that Mr. Pettus has it in for him, Gordo convinces Lizzie to turn in his science project with her name on it and vice versa, which ends up having disasterous results. Also, Matt adopts a hip-hop attitude and insists that everyone call him ""M-Dogg.""

Lizzie and Miranda are excited about the news that singer Aaron Carter is coming to their town to do a video shoot. They enlist Gordo to help them figure out where the shoot will take place so they can crash the set and meet Aaron. Matt horns his way into the group also. When they arrive at the site Matt is mistaken for Aaron's stand-in and let on the set, but the other three are not. They try several ways to sneak in but are always chased off by a security guard. In all the confusion Mr. and Mrs. McGuire somehow manage to get detained by security. Aaron's manager catches the trio and Lizzie convinces her to at least let one of them meet Aaron. She agrees, and Lizzie tells Miranda that she can be the one. Lizzie goes back to get a tape recorder she left behind and runs in to Aaron, who gives her a kiss. The kids all get to be extras in the video.

The various obsessions of Lizzie, Matt and Gordo are driving friends, family, teachers and themselves to distraction. Gordo is intent on winning the Science Olympics at all costs against defending champion Larry Tudgeman. Matt becomes hall monitor at his school and gets carried away with his own power, giving out citations to schoolmates by the dozen and even trying to do the same to teachers and family members. Meanwhile, after she and Miranda work on a successful volunteer project at school, Lizzie becomes an environmental warrior, a fanatic for collecting clothing and food for the homeless, and even a vegetarian! All three learn that they must put limits on their fanaticism or else their original causes will suffer as a result.

Lizzie auditions to be in a fashion show presented by "Teen Attitude" magazine at a local mall and she gets accepted. At the show Lizzie looks great on the stage. Afterward, popular girl Jessica asks Lizzie to come to a party at her country club. Lizzie gets Miranda and Gordo invited also. At the party, all three are enjoying the fun, including the hot tub. But already Lizzie's friends are acting different. When Jessica asks her about coming to another party, Miranda starts answering for Lizzie like a press agent and she and Gordo start negotiating future appearances for her like a supermodel!

At school things are very different, also. Kids stare at her in the hall like she's a celebrity. Kate is now fawning all over Lizzie, wanting to be her friend. Ethan is so starstruck that he can't even mumble a coherent sentence around her. Gordo and Miranda are as bad as anybody. Lizzie muses, "Gordo and Miranda aren't my friends anymore. They're my people!"

Gammy McGuire sends Lizzie one of her frequent ""birthday"" gifts--a role-playing game called Dwarflord: The Conquest. Mom insists that Lizzie play it at least once, so she recruits reluctant Miranda and Gordo for a game. The girls can't understand the incredibly complex rules but Gordo likes it. In fact, Gordo joins a ""Dwarf Tribe"" at school (led by Tudgeman, of course) and begins to spend all his time playing and thinking about the game. Gordo gets so obsessed that he even quits studying and, unbelievably, gets an ""F"" on a test!

Lizzie and Miranda try to talk some sense back into Gordo but he refuses to see he is addicted to the game. Matt agrees to help the girls capture Gordo and help to deprogram him. They stealthily invade a Dwarflord game, abduct Gordo and hold an intervention in which they finally convince him to go back to his old lifestyle.

Gordo and Miranda visit Lizzie after she was out sick and bring her some scary news--in social studies class she has to pair up on a project with---KATE!! Lizzie reacts hysterically. She tries to get out of going to class the next day but her parents make her go. Kate is mad about working with Lizzie also, but she comes by the McGuire house to work on their project, cooking a Latvian dish called an Alexander Tort (a raspberry pastry ). At first the two are hostile to each other, but eventually they have a laugh or two and begin to recall the days when they were friends. Jo McGuire sees them enjoying themselves and tells the girls it seems like old times. Suddenly the girls stop being so friendly, then Kate excuses herself and leaves.

At school Miranda and Gordo ask Lizzie how it went with Kate, expecting the worst. Lizzie says it wasn't so bad. In fact, the two are going to the Digital Bean to do work on a high-speed computer. When they get there, Kate and Lizzie are working fine, but

Lizzie, Miranda and Gordo are obsessed with a Spanish game show, "El Oro de Montezuma." Miranda's cousin, Carlos, is scheduled to compete on the show and Lizzie and her friends decide to be on his team.

Lizzie starts feeling inferior when she realizes a lot of the other kids around her have special talents and skills that they've developed, including Gordo with his film making and Miranda with her violin.

Frankie Muniz visits, which puts a strain on Lizzie's friendship with Miranda and Gordo.

Kate's having a big birthday party and she invites everyone from her class, including Lizzie, Miranda and Gordo. But Lizzie and Miranda's parents refuse to let them go to the party as there would be no adults around. So, Lizzie, Miranda and Gordo lie to their parents and go to the party anyway.

Parker, a girl that Gordo likes, turns down his offer to go with him to the school dance because of his height.

Gordo is irritated by his grandma's new lifestyle choices.

Lizzie fervently hopes to win the grand prize in the Christmas parade with her idea for a "Rock & Roll Christmas" float. The rest of the McGuire family are there, and they are charmed by an eccentric old man in an elf suit who calls himself Nobby Frostybump and seems to really believe he's one of Santa's elves!