Locke stars as Charlie with Connor back as Nick. The rest of the main cast are also returning for season two, including William Gao as Tao, Yasmin Finney as Elle, Corinna Brown as Tara, Kizzy Edgell as Darcy, Tobie Donovan as Isaac, Jenny Walser as Tori, Sebastian Croft as Ben, and Rhea Norwood as Imogen. Oscar winner Olivia Colman plays Nick's mom, Sarah, in the series as well.
The show also previously announced new cast members for season two: Higgs student Sahar Zahid (Leila Khan), Nick's older brother, David Nelson (Jack Barton); Truham student James McEwan (Bradley Riches); and Truham teacher Mr. Farouk (played by Nima Taleghani).