The fourth season of iCarly began airing on Nickelodeon July 30, 2010 and ended on June 11, 2011. The season features Carly Shay, Sam Puckett and Freddie Benson as their own Web Show iCarly is becoming more popular worldwide. Jerry Trainor co-stars as Carly's big brother Spencer. Noah Munck joins the main cast this season as Gibby Gibson. The specials in this season are: iGot a Hot Room, iSam's Mom, iDo, iStart A Fan War, and iOMG.
Spencer tries to surprise Carly for her birthday and ends up burning down her bedroom instead. But when the insurance company hands him a big check, he has a chance to make it up to her.
After fighting with her mom, Sam moves in with Carly, who soon realizes she's a horrible guest. Freddie is stalked by a dangerous criminal after catching him on video committing a crime.
Ridiculed for never pulling a prank, Carly recruits Spencer's help to prank Sam and Freddie. But after Spencer gets a taste for it, he can't stop pranking. The gang must figure out how to stop him.
The gang goes into business making and selling Penny-Tees. After sales go through the roof, Sam recruits 4th-graders to help make shirts. But Carly, Sam, & Freddie disagree about how to treat them.
After an iCarly fan proposes to his girlfriend live on the web show, the gang gets roped into going to the wedding. But when the bride gets cold feet, Carly must come to the rescue.
iCarly gets invited to be guests of honor at WebiCon, but when the fans start asking questions that are too personal, things quickly gets out of hand. Spencer does battle with a costumed nemesis.
The gang decides to hire an intern for the web series. Carly and Sam hire a guy they think is cute, but the new intern proves to be more trouble than he's worth. Freddie has to prove to Carly and Sam that they're better off without an intern.
When a video of Nevel yelling at a little girl surfaces on the internet, Nevel becomes hated by everyone. After celebrating Nevel's demise, the iCarly gang then works to restore his honor after Nevel begs them for help.
The gang spends the night finishing their projects at Ridgeway during the annual school lock-in. Carly and Freddie start to suspect that Sam might have a crush on their new friend Brad.
Carly suspects that her new boyfriend, Steven, is cheating on her with Tori Vega, so the gang plans a trip to Los Angeles to catch him in the act at a party thrown by Andre at Kenan Thompson's house.