Guest Stars Aisling O'Sullivan as Dr. Cathy Costello Catherine Walker as Alice O'Brien Colin O'Donoghue as Conor Elliot Hilary Reynolds as Aideen Boylan Suzy Lawlor as Annie Ward Paul Meade as Paul Brown Iseult Golden as Gareth Doyle Brendan McCormack as Paramedic Stanley Townsend as Michael Kinsella Susan Ateh as Lisa Roberts Paul Reid as Sean Hagan Frank Smith as Estate Agent Art Kearns as Peter Sheridan Stephen Swift as Shay Barbara Bergin as Elayne Sheridan Peter O'Byrne as Steven Foley Deirdre Fagan as Anaesthetist Ellen O'Rahilly as Laura Elaine Murphy as Gerri Foley Aindrias De Staic as Busker Katie Pender as Barbara Sheridan Owen O'Gorman as Retro