Daisy Ridley as Trudy Ederle

Tilda Cobham-Hervey as Meg Ederle

Stephen Graham as Bill Burgess

Kim Bodnia as Henry Ederle

Jeanette Hain as Gertrude Ederle

Glenn Fleshler as James Sullivan

Sian Clifford as Charlotte 'Eppy' Epstein

Christopher Eccleston as Jabez Wolffe

Ethan Rouse as Henry Jr. (Teen)

Olive Elise Abercrombie as Young Trudy Ederle

Lilly Aspell as Young Meg Ederle

Raphael J. Bishop as Young Henry Jr. Ederle

Alex Hassell as Harry Horlick

Alexander Karim as Benji Zammit

Sebastian Griegel as Horst

Doc Butler as Uncle Ederle

Yordan Angelov as Karl Durshley

Robert Eades as Johnny Weissmuller

Hyoie O'Grady as Chip Anderson

Devina Vassileva as Aileen Riggin

Tessa Bonham Jones as Helen Wainwright

Vanina Yordanova as Millie

Saskia Vinkhuyzen as Ruth

Siobhan O'Connor as WSA Swimmer

Andy Sellers as Starlight Pool Lifeguard

Dennis Billingsley as Swim Instructor

Trevor Van Uden as Chip's Friend

Cat Haave as Annette Kellerman

Iliyana Koleva as Australian Female Swimmer

Paolina Popova as Australian Female Swimmer

Owen Davis as Starlight Pool Announcer

Brian Caspe as Starlight Pool Reporter

Nicholas Colicos as Starlight Pool Reporter

Michael Fleming as Radio Station Sound Man

Velizar Binev as Doctor Weiss

Meglena Karalambova as Sullivan's Mother

John Carew as Jonas

Petar Stoychev as English Channel Swimmer

Dimo Alexiev as English Channel Swimmer

Kiril Efremov as English Channel Swimmer

Kexin Wang as English Channel Swimmer

Anton Poriazov as English Channel Swimmer

Michael Amiar as Boat Captain

Bashar Rahal as Reporter on Boat

Sava Dragunchev as Reporter on Boat

Simon Balcon as Reporter at Beach

Roy Hill as Reporter at Beach

Rosen Rosenov as Alsace Bagpiper

Martin Lyamov as Alsace Bagpiper

Justine Viotty as French Nurse

David Calvitto as Mayor Walker

Derek Morse as USS American Crew Member

Paul Boichat as England Customs Officer

Laila Barwick as Young Girl in Butcher Shop

Tsvetan Marinov as Coney Island Street Performer

JR Esposito as Coney Island Cop

Lylianna Eugene as Coney Island Young Girl

Quinn Patrick as Carnival Barker

Ivan Panev as Coney Island Man

Laura Hinton as Coney Island Woman

Howard Chadwick as English Pub Bartender

Mariyan Stefanov as Babe Ruth

Jana Yakovleva as Neighbor

Clive Sawyer as Newsreel British Official

Robert Chapman as Alsace Reporter

Euan Macnaughton as Alsace Reporter