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|Created by||Dan Schneider|
Noah Munck (season 4-present, regular; seasons 1-3, recurring)
|Theme music composer||Michael Corcoran|
|Opening theme||"Leave It All to Me", sung by Miranda Cosgrove and Drake Bell|
|Country of origin||United States|
|Executive producer(s)||Dan Schneider|
Bruce Rand Berman
|Production location(s)||Seattle, Washington (setting)
Nickelodeon On Sunset, Hollywood, California (taping location)
|Camera setup||Videotape (filmized); Multi-camera|
|Running time||30 min.|
|Production company(s)||Schneider's Bakery|
|Picture format||HD: 1080i/720p|
The show is about a teenager, Carly Shay (M. Cosgrove), who lives with her brother Spencer (J. Trainor). Her friends Samantha 'Sam' Puckett (J. McCurdy) and her neighbor Fredward 'Freddie' Benson (N. Kress) play a large part in her life too. Being teenagers, Carly, Sam, and Freddie find they've also become online celebrities with their show, that shows contests, recipes, problem-solving, and random dancing.
- Carly Shay is a 13-year old student and she has an own webshow called: "iCarly". She lives with her older brother Spencer in an Apartment in Seattle. Her best friends are Sam and Freddie. Her father works at the US Navy and she doesn't see him very much. She performs well at school and in every subject she has the grades "very good", but in history she has the grade "good".
- Samantha "Sam" Puckett is Carly's best friend and the female partner of the web show. She is rebellious and often mocks Freddie. She must frequently get detention at Mrs. Briggs. She loves to eat, and her favorite foods are ham, butter cake and hendl.
- Fredward "Freddie" Benson is the best friend of Carly and Sam. He is the technical producer of iCarly. He lives with his mother Marissa Benson in an Apartment next to Carly and Spencer's Apartment. He loves the technology and he is a member of the technology club at the school. He's loved Carly, since the 4th grade. He once saved Carly's life and he had a relationship with her. He also had a relationship with Sam, it changed his life.
- Spencer Shay is a 26-year old adult and the brother of Carly. He is single and loves the socks of Socko. He was a law student for 3 days. He interrupted his studies, because he would want an artist. As an artist, he builds different sculptures. In the episode "iRue the Day" he saved the singer of the Plain White Ts' life. Also, he has two world records. He loves to make spaghetti tacos.
- Orenthal "Gibby" Cornelius Gibson is a boy, who goes to school with Carly. He has a girlfriend named Tasha. He pulls his shirt off in front of other people, but after season 4 he doesn't take off his shirt. Also, he has a little brother with the nickname Guppy.
- Marissa Benson is Freddie's overprotective mother. She is sensitive and has often worry, that something might happen to him. She observes always her neighbor Spencer, because she has worry for his sister.
- Lewbert is the bad doorman of Carly's and Freddie's Bushwell Plaza apartment home. He has a big wart on his left cheek. He shouts at people, who enter his lobby. Also, he is in love with Marissa. Lewbert fought with Fredrick "Freddie/Fredward" Benson (Carly's boyfriend) on the episode April Fools day.
- T-Bo is a seller by "Groovy Smoothie". He tries to sell his bagels, muffins, pickled gherkins etc on his stick. You see him in season 2 and 3 and in the 4th season he is particulary to be seen.
- Ms. Briggs and Mr. Howard are teachers in Carly's School. Carly and her friends do jokes about them. Ms. Briggs plays bagpipes. Mr. Howard hates children.
- Guppy is Gibby's younger brother. He looks just like Gibby.
- Nevel Amadeus Papperman is a web-critic. He has a website called nevelocity.com. About millions of people surf on his site. He makes plans for revenge about Carly, because he wanted to kiss Carly, but she didn't want it.
- Chuck Chambers is a boy, who lives in Carly's apartment. He hates Spencer, because he had forbidden to him to play ball in the apartmenthouse. He has an older sister named Gia and younger brother named chip who individually appear in the show and he gets tutoring at Carly.
- Principal Ted Franklin is the principal at the Ridgeway Secondary School, the school where Carly, Sam and Freddie attend. He is a big fan of iCarly.
- Jeremy is a sick boy at Carly's school. He was seen in season 1.
- Socko is the best friend of Spencer. You don't see him in any episodes.
- Austin Butler as Jake Crandall in iLike Jake
- Tom Higgenson and the Plain White Ts as himself in iRue the Day
- James Maslow as Shane in iSaw Him First
- David Archuleta as himself in iRocked the Vote
- Lucas Cruikshank (Fred) as himself in iMeet Fred
- Haley Ramm as Missy in iReunite With Missy
- Christopher Michael as Officer Carl in I Want More Viewers and iMove Out
- Betsy Rue as Ginger Fox in iFix A Popstar
- Drake Bell as Drake Parker in iBloop
- Drew Roy as Griffin in iDate A Bad Boy and iBeat The Heat
- Jane Lynch as Pam Puckett in iSam's Mom
- Ethan Munck as Guppy Gibson in iPsycho, iSell Penny Tees, I Do, iStart A Fan War and iBust a Thief
- Jack Black as Aspartamay in iStart A Fan War
- Alec Medlock and Scott Halberstadt as Craig and Eric in iStart a Fan War
- Jake Farrow as Gavin in iStart a Fan War
- Abby Wilde as Stacey Dillsen in iMove Out, iQuit ICarly, iSaved Your Life, iStart A Fan War and iHire An Idiot
- Jorge Enrique Abello as the TVS Director in iCarly Saves TV
- Leon Thomas III as Harper in iCarly Saves TV and as André Harris in iParty with Victorious
- Victoria Justice as Shelby Marx in iFight Shelby Marx and as Tori Vega in iParty with Victorious
- Daniella Monet as Popular Girl in iPsycho and as Trina Vega in iParty with Victorious
- Matt Bennett as Robbie Shapiro in iParty with Victorious and as Gibby Gibson in iApril Fools
- Elizabeth Gillies as Jade West in iParty with Victorious
- Ariana Grande as Cat Valentine in iParty with Victorious
- Avan Jogia as Beck Oliver in iParty with Victorious
- Kenan Thompson as himself in iParty with Victorious
- Jim Parsons als Caleb in iLost My Mind
- Michelle Obama as herself in iMeet the First Lady
- One Direction as themselves in iGo One Direction
- Jimmy Fallon as himself in iShock America
- Emma Stone as Heather in iFind Spencer Friends
- Dan Schneider as Meekalito in iGoodbye
- Kyoko and Yuki are rivals who argued with each other in the car.
On August 29th, 2010 had Dan Schneider, the author of the TV-series iCarly and Victorious about Facebook and Twitter to confirmed, that the script was completed for the crossover. It was to aired on June 11th, 2011 in the USA. On October 1st, 2011 it was to seen in Germany.
On November 2012, it was announced, that the last episode in 6th season will be final iCarly episode.
The first spin-off called Gibby is a TV-Series, who will tells about his life and works in a Recreational Center but later, Nickelodeon canceled the production.
The second spin-off is Sam & Cat. It's a Victorious and iCarly Crossover. Sam and Cat start to incorporate a Babysitting company when they were accidentally met. It (pilot) was successful and Nickelodeon picked it up.