Sarah Phelps Creator, Executive Producer Sarah Greene Cassie Maddox Actor Killian Scott Rob Reilly Actor Antonio Aakeel Rafe Lahiri Actor Moe Dunford Sam O'Neill Actor Vanessa Emme Abby Stone Actor Jonathan Forbes Dr Mark Hanley Actor Jonny Holden Damien Donnelly Actor Sam Keeley Daniel March Actor Charlie Kelly Justin Mannering Actor Ian Kenny Phelan Actor Peter McDonald Jonathan Devlin Actor Leah McNamara Rosalind Devlin Actor Alexandra Moen Simone Cameron Actor Eugene O'Hare Detective Quigley Actor Conleth Hill O'Kelly Actor Tom Vaughan-Lawlor Frank Actor Alan Gasmer Executive Producer Ed Guiney Executive Producer Elizabeth Kilgarriff Executive Producer Kate Harwood Executive Producer Noemi Spanos Executive Producer Peter Jaysen Executive Producer Rebecca Gatward Executive Producer, Director Saul Dibb Executive Producer Carmel Maloney Producer