* Annabel Scholey as Grace Jones
* Daniel Kaluuya as Daniel
* Tim McInnerny as Dr. Clive Smith
* Laura Birn as Anna Kleinmann
* John Hurt as Robert Kleinmann
* Simon Russell Beale as Uncle David
* Tom Bell as Grandpa Tom
* Eileen Atkins as Grandma May
* Richard Graham as Uncle Roger
* Joanna David as Auntie Hilary
* John Simm as Dr. Alex Bolt