Guest Stars Simon O'Gorman as Billy Flanagan Tomás Ó Súilleabháin as Ronan Donaghue Orla O'Rourke as Sinead Kelly Marian Araujo as Marta Lopez Niall Toibin as Dr. Paul O'Callaghan Matthew Keenan as Sam Connolly Gabrielle Reidy as Meg Duffy Liam Cunningham as Malcolm Keown Jonathan Byrne as Will Cafferty Cian McCormack as Emmet Keown Tina Kellegher as Jean Keown Charlotte Bradley as Sonia Harper Nicholas Grennell as David Harper Shani Williams as Danielle