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 sees the introduction of a new cast; it follows the lives of the third generation of characters, which consists of Franky Fitzgerald, Rich Hardbeck, Mini McGuinness, Liv Malone, Alo Creevey, and brothers Nick and Matty Levan.

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.