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

Cast: Miranda Cosgrove, Jennette McCurdy, Nathan Kress, Jerry Trainor, Noah Munck, Boogie, Kristi Clainos, Chloe Csengery, Charles DeWayne, Rain Gregorio, Kyle Matthew Hamilton, Niall Horan, Zayn Malik, One Direction, Liam Payne