Set in early 1990s Belfast, the Channel 4 series follows teenagers Erin (Saoirse-Monica Jackson), Orla (Louisa Harland), Clare (Nicola Coughlan), Michelle (Jamie-Lee O'Donnell), and James (Dylan Llewellyn) as they navigate teenage life at a Catholic girls' school, against the backdrop of the end of the Troubles in Northern Ireland. 

After the series two finale saw James' emotional decision to stay in Derry as a true '"Derry girl", the new trailer shows the whole gang back together in their usual mishaps as their final school year comes to a close.

The release date for the final series is yet to be announced.

Watch the trailer in full below.