Carly is convinced that a show in Hollywood is stealing her ideas, so she and her friends take a trip to Los Angeles in order to stop the cast and crew.

Surprise, surprise! Sam has a twin sister named Melanie. Even more of a surprise, she's much girlier than Sam and quite fond of Freddie, who suspects that she's actually Sam in disguise. In the meantime, Carly offers to tutor a boy named Chuck, who has been a sworn enemy of Spencer, who struggles to convince her that he's a little brat.