- Gareth Berliner - Thomas Taylor
- Darragh Cowley - Young Man
- Lily-Rose Aslandogdu - Naomi Banks
- Gerard Kearns - Henry Banks
- Michael Jibson - Matthew Evansford
- Nitin Ganatra - Charles Ambrose
- Dixie Egerickx - Jo Ransome
- Michelle Asante - Maureen Fry
- Robin Berry - Jonah
- Rebecca Ineson - Gracie Banks
- Cal MacAninch - Michael Seaborne
- Paul Antony-Barber - Rollings
- Tommy French - Samuel
- Christopher Fairbanks - Cracknell
- Deepica Stephen - Sali
- Yaamin Chowdhury - Nev
- David Streames - Landlord
- Neil Harget - Pub Man
- Jenny Bolt - Harbour Woman
- Law Ballard - Aldwinter Woman
- Nicholas Goh - Doctor Zhao
- Matt Brewer - Fisherman One
- Steve North - Fisherman Two
- Jamael Westman - George Spencer
- Richard Southgate - Violinist
- Raul Fernandes - Professor Marchand
- Benedick Blythe - Dr Beecham
- Anna Kirke - Mrs Beecham
- Greta Bellamacina - Trainee Surgeon
- Lola Dauda
- Malcolm Davies
- Anna Symon
- Sarah Perry
- Francesca Castelbuono
- Harriet Lawrence
- Hannah Jennings
- Jamie Laurenson
- Dagmara Plazewska
- Hakan Kousetta
- Dustin O'Halloran
- Herdís Stefánsdóttir
- Tim Barker
Claire Danes hace el papel de Cora Seaborne.
Tom Hiddleston interpreta a Will Ransome en la serie.
Frank Dillane interpreta a Dr Luke Garrett en la serie.
Clémence Poésy interpreta a Stella Ransome en la serie.
Hayley Squires hace el papel de Martha.
Capítulo disponible en las siguientes plataformas:
