Andy Serkis as Albert Einstein

David Tennant as Arthur Eddington

Richard McCabe as Frank Dyson

Patrick Kennedy as William Marston

Rebecca Hall as Winnie Eddington

Jim Broadbent as Sir Oliver Lodge

Jacob Theato as Eduard Einstein

Callum Williams as Hans Einstein

Lucy Cohu as Mileva Einstein

Donald Sumpter as Max Planck

Anton Lesser as Fritz Haber

Paul Brooke as H H Turner

Eleanor Tomlinson as Agnes Muller

Jodhi May as Elsa Einstein

Philip Whitchurch as Uncle Rudolf

Kika Markham as Aunt Fanny

Benjamin Uttley as Tennis Player 1