Jodie Whittaker
— Mary Boon
Olivia Colman
— Janet / Nurse Violetta Kiss
Emilia Fox
— Kirstie
Daniel Mays
— Charles Boon
Patrick Kennedy
— Gerald Mills
Patrick Baladi
— Dr Grant / Dr Steele
O-T Fagbenle
— Jack
Nicholas Sidi
— Nick
Marcia Warren
— Elsie
Paul Nicholas
— Alan Boon
Adam James
— Mick
Angela Terence
— Lizzie
Ben Addis
— Frederick
Amy Marston
— Margaret Boon
Antonia Kinlay
— Lorelei
Robert Horwell
— Brian
John Kirk
— Hospital Orderly