Carly is sad when her father cannot escort her to a military dance. Sam and Spencer fix a motorcycle. Gibby gets his head stuck in an "artificial head machine" (because he sold his first one at the pawn shop). Freddie gets a new phone.

After arguing, Sam and Carly decide to end iCarly for good. Meanwhile, Spencer gets obsessed with winning a boat only to find out he has no place to put it.

After discovering Kyoko and Yûki's sabotage attempt, Marissa locates the lost iCarly gang. The group reunites and gets to the iWeb Awards, but are apprehended when the guards do not understand English.

Nevel's image is ruined after a video of him berating a child goes viral, so he asks Carly and the gang for help in restoring his reputation.

After Carly recruits Spencer to help her prank Sam and Freddie, Spencer can not stop pulling pranks.

Carly is dating a boy named Steven who divides his time between his divorced parents who live in Seattle and Los Angeles. Meanwhile, Tori is also spending time with her new boyfriend who, unbeknownst to her, is the very same boy Carly is seeing. The iCarly gang stumbles upon a photo of Steven and Tori on The Slap. André gets permission to host a party at Kenan Thompson's house with his friends.

Carly's show's 50th airing is coming up but Sam gets detention. Carly and Freddie do bad things to get in detention to shoot the show from there. Meanwhile, Spencer drops his phone into a large coffee cup built by him

When Freddie offends an international internet sensation, Fred, he gets crushed and says to all of his fans that he will not make any more Fred videos. Carly, Sam, and Freddie soon start losing friends and acquaintances that are fans of Fred, and everybody in Ridgeway Jr High hates the iCarly group and Freddie is banned from all clubs. Then meet Lucas, Fred's creator and portrayer, in his home in Idaho for Freddie to forgive him about the Fred videos comment. Lucas later apologizes because he wasn't really mad, it was so Fred and iCarly had more ratings. At the end they apologize live in the iCarly webshow and presented a new Fred video with Carly, Sam, Feddie and Spencer guest starring as themselves with high-pitched voices like Fred. Meanwhile Spencer puts a Magic Eight Ball-like toy (called a "Magic Meatball") in control of his life, with disastrous results.

With Spencer's blessing, Carly and Griffin's relationship advances happily and without flaw, until Griffin reveals that he obsessively and neurotically collects a series of stuffed animals called "Pee Wee Babies".

Spencer finds a Pak-Rat video game cabinet in a junkyard and becomes addicted to it, whilst procrastinating on a commissioned Labradoodle sculpture. To curb his addiction, Carly brings Sasha Striker, the top Pak-Rat player in the world, to compete against Spencer to defend her title as the world champion of Pak-Rat. Meanwhile, Freddie experiences a streak of "bad luck" after deleting and not forwarding a chain email, passing it off as a superstition.

Carly and the gang try to prove that there is a Bigfoot somewhere out there.

Spencer tries to give Carly the best birthday ever. He lets Gibby's grandfather cut his hair and Spencer makes Carly a gummy bear lamp. Everything thing goes bad after a gummy bear lamp Spencer made catches Carly's room on fire. Spencer then finds out that his relative's watch that Carly had was destroyed and was worth $82,000. Spencer convinces Carly to get a part-time job at the Groovy Smoothie while he, Freddie, Sam, and a working crew put together an amazing new room to Carly's surprise.

The iCarly Crew performs sketches on their show that spoof those on "Late Night with Jimmy Fallon," which the host finds so impressive, that he invites them on his show for a rare live performance. Thanks to some of Gibby's usual misfortune however, the cast of both shows almost gets in trouble.

The iCarly gang travel to Tokyo after the show is nominated for a prestigious iWeb award.

Carly has to do a project for green week, so she makes an electric scooter. But, it can only go for 4mph and it caught on fire, so she is given the weekend to make a new project. Spencer brings in a good-looking Science geek named Cal who helps her make a generator for iCarly, and Carly gets an A+. It is then revealed the generator was illegal and Cal was a criminal for buying Uranium, so she has to go on the Root-and-Berry Retreat to get extra credit.

On iCarly, Sam's tooth falls out, leading Carly to take Sam to the dentist. When the doctor gives Sam laughing gas, Sam accidentally reveals that she and Freddie shared a secret kiss with each other. Carly gets angry because friends aren't supposed to keep secrets, but in the end she is OK with it. Meanwhile, Spencer teaches an art class in a prison, he and the prisoners build a big pair of pants that two prisoners hide in and jump out in Carly's house and tape Carly Sam and Freddie to three chairs after Freddie threatens to call the Police.

When Carly has trouble finding a date to a dance, Sam asks for Seattle-area boys to apply to be her date. When the gang is overwhelmed by the amount of boys who show up, they hold a speed-dating session. Meanwhile, Carly convinces Sam to ask Gibby to the dance since no one else did, but Sam becomes enraged when Gibby turns her down. Carly finally finds a boy, whom after the dance, she dumps for being so talkative. In the end, Carly and Freddie share a dance together at the Groovy Smoothie, which Sam walks in on. Upon seeing them, she silently leaves.

Carly, Sam, Freddie, and Spencer finally get to attend a Webicon. However when they arrive, Spencer meets an old nemesis, and the web-hostesses find themselves caught in a heated rumor over which of the two girls are dating Freddie.

Carly's grandfather comes for a visit and is appalled by Spencer's unusual behavior, so he questions Spencer's ability to be in charge. Carly must convince him that Spencer is capable of being her guardian.

Sam owes Carly and Freddie $526, so she gets a job to earn the money, and pay them back. Carly, Sam, and Freddie make a broadcast on iCarly to all their fans to donate money to Sam. However, they find out its illegal to solicit money over the internet. Meanwhile Spencer tries to impress an attractive single mom by helping her daughter sell fudge balls, an equivalent to Girl Scout cookies, but two scouts stole Spencer's place at the market. Spencer comes up with the idea to send every iCarly fan who sent them money to send them fudge balls. Carly and Freddie then hire someone to give the money they earned to Sam in a tip. At the end, everyone enjoys what Sam got with her money except Spencer.

The group lands in a deserted area of Tokyo, where they are found by a Japanese policeman who brings them safely to their hotel. They are visited by Kyoko and Yûki, the stars of a competing webshow. The pair give Spencer and Marissa free passes to a Nakamura Spa where their cousins work and take Carly, Sam and Freddie shopping.

When Carly's old friend Missy Robinson returns to Seattle, Sam believes Missy is trying to replace her as Carly's best friend.

Carly, unaware of an oncoming taco truck, is pushed aside by Freddie, who subsequently gets hit. Carly, grateful to Freddie for saving her life, develops an attraction towards him. However, Freddie thinks that this attraction stems from his actions, and not himself, so the two break up but agree that if the whole "hero" thing wears off that if Carly still feels attracted to him they'll try the relationship again. Meanwhile, Sam and Spencer engage in an intense game of assassin.

Three days after the lock-in at Ridgeway, Carly and Freddie find out that Sam put herself in the Troubled Waters Mental Hospital, for thinking she has lost her mind when she fell for Freddie. Carly, Gibby, Freddie, and Spencer try to break her out.

It's Carly and Sam versus Freddie and Spencer in the ultimate competition to see who can attract more viewers to the show. Things go crazy when they carry out their plans.