Carly's grandfather makes a surprise visit and is none too thrilled by Spencer's unusual behavior, so he questions his ability to be in charge. Carly must convince him that her brother is up to the task of being her guardian.
Carly is thrilled to book the Plain White T's for her show, but her rival Nevel plans to ruin the event. So Carly and her friends try to shut down Nevel's site, Nevelocity, before he can hack into their system.
When Carly is upset about receiving a B on a history paper, Sam finds a way to change the grade in the school computer. But Carly feels guilty about the switch, especially after Spencer creates a giant statue in her honor, so she and Freddie try to fix the falsified grade.
Carly invites her biggest fan to watch the show live, but it turns out the girl is a bit too obsessed and now the kids can't get rid of her. Meanwhile, Spencer finds out his band tolerates him only so they can practice in the apartment.
Carly is excited to get a show sponsor and readily endorses a new type of shoe. When the product turns out to be a dud and fans complain, the gang tries to find a way out of the contract. Elsewhere, Spencer falls asleep on the bus and ends up in Canada.
The show's 50th airing is in jeopardy when Sam gets detention, so Carly and Freddie try to get in trouble as well to shoot "from the inside" with Sam. Meanwhile, Spencer builds a giant cup of coffee, but drops his phone into it.
Carly tries to help a friend get a date with his crush by setting up a dating-game segment on the show. But when some of the contestants fail to appear, Carly steps in and finds herself in line to be the winner.