Extras is a young adult science fiction novel written by Scott Westerfeld.
The novel was published and released by Simon & Schuster on October 2, 2007, and is a companion book to the Uglies series.
However, Extras differs from its predecessors in that its protagonist is fifteen-year-old Aya Fuse, not earlier protagonist Tally Youngblood.
The book was received well by critics such as the New York Times's James Hynes.
Three years after the events of Specials freed the world from the pretty lesions which forced them to be obedient, society is beginning to settle into a new form.
Each city has been forced to find a way of dealing with the new pressure on its resources, caused by the freed creativity of the inhabitants.
In Japan, one city has chosen a "reputation economy", rewarding citizens either with merits for productive tasks which help the city, or with face rank, a measure of popularity.
The next day, she visits her famous brother Hiro in New Pretty Town, another kicker who is celebrating reaching the "top thousand" - a list of the thousand most famous people in the city.
Hiro and his friend Ren Machino refuse to believe Aya's tale of the Sly Girls, who are an urban legend in the city, but Ren, who designed Moggle, agrees to help Aya retrieve him.
Aya also happens upon a story about Frizz, discovering that he started a clique based around brain surgery which enforces honesty.
That evening, Aya goes mag-lev surfing with the Sly Girls, enjoying the experience in spite of not having a camera to film it with.
Every inhabitant has their own feed and obsessively tracks their face rank, hoping to gain fame and lose their status as an "extra".