The gang returns in style, burning their way through a new term at Roundview as new friendships, secret relationships and sexual awakening complicate their already messy lives. Caught between past and present, the bonds between them are tested as they learn what it really means to be a friend, a lover, an adult.

This series follows the lives of sixth form students Tony Stonem, Michelle Richardson, Sid Jenkins, Cassie Ainsworth, Chris Miles, Jal Fazer, Maxxie Oliver, Anwar Kharral and new character Lucy "Sketch".

Like the previous series, this series follows the lives of the second generation, which consists of Effy Stonem, Pandora Moon, Thomas Tomone, James Cook, Freddie McClair, JJ Jones, Naomi Campbell, and twin sisters Emily and Katie Fitch.

The final series sees the return of several characters from the first two generations of the show.