Guest Stars Annes Elwy as Greta Catherine Ayers as Sali Ella Peel as Ela Morgan Hopkins as Dai Rees Dylan Jones as Young Joe Sian Reese-Williams as Caryl Ioan Hefin as DCI Parry Aneirin Hughes as Gafyn Ifan Huw Dafydd as Wyn Rhian Blythe as Shelley Aled Bidder as Rhys Mari Ann Bull as Young Shelley Hannah Daniel as Izzy Delyth Wyn as Eilis Hannah Mary Dando as Alana Andria Doherty as Bronwen Lisa Palfrey as Nina Shelley Rees as Ceri-Ann Lily Beau Conway as Sasha Mabli Jên Eustace as Young Izzy Glory Lewis-Rowe as Young Greta