Carly Shay (
Miranda Cosgrove) (
iCarly) is dating a boy named Steven Carson (
Cameron Deane Stewart), who divides his time between his divorced parents in
Seattle and
Los Angeles. Every other month, Steven goes off to Los Angeles, where he is also dating Tori Vega (
Victoria Justice) (
Victorious), who attends Hollywood Arts, a high school for the performing arts. Robbie Shapiro (
Matt Bennett), a socially awkward friend of Tori's, posts a picture of Steven and Tori online, which Carly and her friend Sam Puckett (
Jennette McCurdy) stumble upon. Carly denies that Steven is cheating on her, but Sam seeks to prove otherwise. Carly, her brother Spencer (
Jerry Trainor), Sam, and their friends Freddie Benson (
Nathan Kress) and Gibby Gibson (
Noah Munck) travel to Los Angeles. They visit Spencer's ex-girlfriend, Monie (
Jen Lilley), who happens to be a skilled make-up artist, and receive disguise makeovers to avoid being recognized from
iCarly. They then head off to
Kenan Thompson's house after hearing of a party where Steven might be. Meanwhile, while having lunch at Hollywood Arts High School in Los Angeles, Andre Harris (
Leon Thomas III), another friend of Tori's, announces that his real estate agent uncle sold a house to Kenan, who gave permission for Andre to host a small party there as he scheduled to move the month after since he is in New York. Rex, Robbie's ventriloquist dummy, has
tweeted about the party, resulting in hundreds of people attending, much to Andre's dismay. The
iCarly gang enter Kenan's house during the party and split up to search for Steven. Spencer discovers that the house includes a
jacuzzi and relaxes in it, leading to him meeting Tori's teacher Sikowitz (
Eric Lange) and her friends Beck Oliver (
Avan Jogia) and Jade West (
Elizabeth Gillies). Kenan unexpectedly shows up to the house, having expected a bigger party, and is disappointed to see that his stalker has showed up, dressed in a panda suit and assaulting people with a
tennis racket. Sinjin Van Cleef (
Michael Eric Reid), another student at Hollywood Arts, falls into the jacuzzi when a surfing arcade game malfunctions. Meanwhile, Carly catches Steven and watches him kiss Tori, after which she admits that Sam was correct about Steven cheating on her. Carly and her friends remove their disguises, explain the situation to Tori, and together come up with a plan to humiliate Steven. As Kenan and Andre are trying to catch the Panda stalker, the
iCarly gang and Tori eventually convince him to join their plan. They lure Steven into a closet where he thinks he will make out with Tori for a "100th day anniversary". Instead, when Steven enters the closet, he finds himself on an
iCarly webcast with Carly, Sam, Kenan, and Tori, who reveal Steven's deceit to
iCarlys one million audience members before they both dump him; Steven becomes embarrassed and flees. Some time later, Sam defeats Rex in a rap battle. The
iCarly gang then join Tori and her friends in
karaoke, where they end the special by singing "Leave It All to Shine", a mash-up of the
iCarly and
Victorious theme songs. ==Cast==