Carly and martial-arts champ Shelby Marx (Zoey 101's and Spectacular!'s Victoria Justice) agree to have an exhibition fight for charity after Carly jokingly challenges her to a match. Unfortunately, Carly accidentally falls on Shelby's grandmother during a press conference. Thinking Shelby wants revenge, Carly backs out of the fight, only to be ridiculed as a coward. Carly visits Shelby and apologizes, and the fight is back on. However, Nevel Papperman alters a clip of the press conference to make it look like Carly intentionally tackled Shelby's grandma to dupe Shelby into fighting Carly. Shelby, furious, attacks Carly for real during the match, Carly then holds Shelby's leg for the rest of the "fight".

When a heat wave hits Seattle and knocks out the power, Spencer activates an exotic air conditioning unit, providing the only cool air in the city. His and Carly's apartment is soon overrun with neighbors looking to take advantage of the opportunity.

One Direction is performing on iCarly, but Carly and Harry get sick.

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.