Carly and Sam develop a crush on Freddie's pal, Shane (James Maslow) and decide to compete with each other for a relationship with him. They decide that whoever can get Shane to kiss them gets the right to pursue him. The girls set up several different scenarios to try to convince Shane into kissing them, but they are unsuccessful. Meanwhile, Spencer hires an incompetent repairman dancer to fix the elevator because he thinks it'll take longer. Shane eventually finds out about the girls' endeavors to pursue him, and angrily tries to leave the Shays' apartment. However, he is unaware of the broken elevator, which causes him to fall down the shaft. After the accident, the gang go and visit an unconscious Shane in the hospital. While no one is looking, Carly kisses Shane and deems herself victorious.

In the first iCarly movie, the trio learn they have been nominated for an iWeb award and win tickets to attend the award ceremony in Japan. Spencer then trades the three first-class tickets for 5 coach tickets when Mrs. Benson refuses to let Freddie go without her. The five later parachute into Japan out of an unsanitary possum-filled cargo plane after the pilot literally makes them fly "over" Japan. A police officer takes them to their hotel after they land in a barren field. At the hotel, they are visited by Kyoko and Yuki, fellow competitors for the same award. Kyoko and Yuki give Spencer and Mrs. Benson tickets to the hotel spa to get seaweed massages by their cousins, while they take Carly, Sam and Freddie shopping. After confessing they are lost, Kyoko and Yuki pretend to get angry at each other and stage a kung fu fight on the sidewalk. They then strand the trio in the middle of nowhere after giving a phony excuse to leave, while Spencer breaks himself and Mrs. Benson free from being wrapped in seaweed after being abandoned by the cousins. Using a locator chip implanted in Freddie's head, Mrs. Benson and Spencer take a taxi to find the lost trio. They reunite and make it to the ceremony but are apprehended by security. Freddie wires his video camera into the main screen while Carly and Sam try to explain to the security officers what happened by acting, since the guards cannot speak English and the girls cannot speak Japanese. Since Freddie hooked up the camera to the big screen, the audience can see their silly acting. Thanks to Freddie, iCarly wins the award show due to their performance. Kyoko and Yuki are arrested for kidnapping, and the iCarly gang return to America on a fishing boat, having refused to go back on the cargo plane.

When iCarly convinces their viewers to vote for David Archuleta on America Sings, they cause him to win. They feel sorry for the runner-up, Wade Collins (Alex Schemmer), who claims he wanted to win the prize money to help his sick mom get surgery. They invite Wade for an interview on the webshow and agree to make him a music video. But after the show, he snaps at the iCarly gang for ruining his life by ruining his chance of winning the contest, and is revealed to be very rude, angry, obnoxious, and narcissistic. Despite his cruelty, Carly, Sam, and Freddie help make a music video for Wade Collins. The iCarly team soon finds that Wade's mother was not sick, but he steals the video from them and gets away before they can stop him. They later have David Archuleta appear on their show and give their support to him once more; afterward they show a video to their viewers depicting Wade Collins's true selfish, rude behavior, ending with him revealing that he hates everything from children, teenagers, animals, and even America. Meanwhile, Sam teaches Spencer to lie when he has a rented movie that is 10 years overdue and he fails to lie at the rental store, but the store manager reveals that it was a prank from her boss.

When Freddie offends an international internet sensation named Fred and tells the whole world he does not think his Fred videos are very funny, Fred tells all of his fans that he will not make any more videos. Carly, Sam, and Freddie soon start losing friends, acquaintances, and iCarly fans that are fans of Fred, and everybody at Ridgeway Junior High begins to hate the iCarly group by booing and throwing stuff at them. Everyone even begins abusing Freddie in many painful ways and he unfairly gets kicked out of all his clubs. Before they got home, his aunt Jennifer called him on the phone talking to him about what he did, a Fred fan created a website called neverwatchiCarly.com that gets viewers to stop watching iCarly, and reporters barged into Carly's apartment and starts criticizing them by interviewing them about the incident. They meet Lucas Cruikshank, Fred's creator and portrayer, in his home in Shelby, Idaho for Freddie to apologize to him about the Fred videos comment and giving his opinion. Lucas later apologizes because he was not really mad; it was a publicity stunt meant to increase Fred and iCarly's ratings. At the end they apologize live during the iCarly webshow and present a new Fred video with Sam, Freddie, and Spencer guest starring as themselves with high-pitched voices like Fred except Carly's voice. Elsewhere, Spencer puts a Magic Eight Ball-like toy, called a Magic Meatball, in control of his life, with disastrous results such as drinking ketchup and buying a live ostrich.

Special guest star: Lucas Cruikshank as himself/Fred

Carly and Spencer catch their new neighbor, Griffin, stealing Spencer's motorcycle. They reprimand Griffin, but Spencer eventually lets him off the hook, despite Carly's begrudging disposition. Following this incident, Spencer befriends Griffin andmentors him by inviting him over to help with a sculpture - much to Carly's dismay. After working on the sculpture for some time, Spencer goes out to buy smoothies for the group. Spencer then returns home to see Griffin kissing Carly, who frantically tries to explain her newfound feelings for Griffin, but this only infuriates Spencer further. Consequently, Spencer forbids the couple from seeing each other by policing Carly's daily life. Sick of Spencer's paranoid regimen, Carly and Griffin devise a plan to see each other. Their plan is quickly thwarted by Spencer, who, despite their deceptive efforts, finally lets the couple be together.

Meanwhile, Sam pays Freddie to build a website for her, and has a contract written up as well. Freddie agrees, and begins building the website around Sam's request. However, as their partnership progresses, Freddie expresses that he cannot keep up with Sam's numerous demands, and tears up the contract. Sam then reveals that she has sold the website for $1,000, and because of their voided contract, Freddie is not entitled to any of the profit. Sam later turns to Spencer to help with a strange nightmare she has been having about a monster eating her soup.

Carly's old friend, Missy Robinson (Haley Ramm) from when they were young, returns to Seattle and tries to become Carly's only best friend and replace Sam. After inviting Sam and Carly to a ride on helicopter, she texts Sam the wrong address, sending her to a piñata shell factory instead. Missy then "accidentally" destroys Sam's cell phone, and gives her expired chocolates, which make Sam fall sick right before the webcast while Missy substitutes for her. Sam realizes Missy is up to something, but no one believes her since they think that Sam is just being paranoid. When Carly is not around, Missy confesses to Sam, believing that Carly will not believe anything bad about Missy. Sam is forced to ask Freddie for help although he initially refuses because he is mad at her for violating his clothes at school until she admits this is the first time she had ever asked him for his help in a serious situation. When he wins a six month cruise that was given to him by the school, he gives it to Missy so she will go away. Shortly after Missy is awarded with the cruise, Carly overhears Missy's plans to destroy her and Sam's friendship and abandons Missy angrily. Later, Wendy tells Carly that Freddie gave the trip to Missy and Carly realizes that Freddie does care about Sam. Carly then mentions that Missy used to get seasick but probably got over it, however in the last scene it is shown that Missy still does get seasick and the cruise is anything but luxurious. Elsewhere, while packing for a camping trip, Spencer is locked in the basement by Chuck, who is seeking revenge on Spencer for telling on him and getting him grounded for playing racquetball in the lobby for two days when he was filling in for Lewbert in the episode iHurt Lewbert, so Chuck says that Spencer is "grounded" for two days. Chuck is eventually caught and is grounded by his father once again, only though Spencer remains trapped in the basement.

Carly and Sam assume that Freddie is gullible after they trick him into coming to school dressed as a clown. Sam later gets annoyed when her twin sister Melanie comes home for three days. Believing it is just another of Sam and Carly's pranks to show how gullible he is, Freddie does not believe it, so he invites Melanie to a dance with him as his date. The plan to prove Melanie is really "Sam" takes an unexpected turn when Melanie kisses Freddie, who then becomes extremely paranoid. Since Freddie refuses to believe it, Sam "admits" to Freddie that there is no Melanie. Satisfied, Freddie leaves right before Melanie arrives to go to the mall with Sam and Carly. Elsewhere, Carly tutors Spencer's nemesis Chuck in math, and Spencer tries to prove to Carly how evil Chuck really is. After several failed attempts, he sets up a secret webcam which captures Chuck harming Spencer when Carly is not in the room. Carly gets revenge on Chuck by telling him there is a new number called "derf" between 5 and 6, and because of this, Chuck fails his math test. Spencer gives Chuck's dad a brochure about a summer math camp he attended as a kid, called Camp Add-em-Up, sending Chuck to math camp for the whole summer.

After watching martial-arts champ Shelby Marx (Victoria Justice) win another MMA match on TV, Carly jokingly challenges Shelby to a match while on the webcast. However, someone then edits the joke challenge to make it look and sound serious, which Shelby sees and surprises a frightened Carly by wanting to fight her. However, as Shelby promises not to hurt her, they agree to have an exhibition fight for charity. Unfortunately, Carly accidentally falls on Shelby's sickly grandmother during a press conference after Sam teaches her how to "trash talk", causing Shelby to get angry. Fearing that Shelby will hurt her Carly withdraws the fight only to be ridiculed as a coward by her friends, teachers, and Nevel. Carly visits Shelby and apologizes, and the fight is back on, with Shelby again promising to go easy on her. Nevel later alters a clip of the press conference to make it look like Carly intentionally tackled Shelby's grandma to dupe Shelby into fighting Carly. Shelby, furious, legitimately attacks Carly during the match. Carly clings onto Shelby's leg for the rest of the fight to avoid being hit. Nevel's plot is revealed and as punishment, he is trapped in a cage with an angry Shelby, Carly, and Sam. Shelby later appears on iCarly, now firm friends with the gang. Elsewhere, Spencer suffers from ridiculous side effects while taking an experimental allergy medication given to him by a doctor. The effects include sweating, itching, uncontrollable thirst, short-term memory loss, and muscle spasms.

Special guest star: Victoria Justice as Shelby Marx