Arthur Eddington
Frank Dyson
William Marston
Tennis Player 1 (as Ben Uttley)
Tennis Player 2
Winnie Eddington
Sir Oliver Lodge
Albert Einstein
Eduard Einstein
Hans Einstein
Mileva Einstein
Max Planck
Librarian
Fritz Haber
Leopold Koppel
Elsa Einstein
Uncle Rudolf
Aunt Fanny
H H Turner
Herr Muller
Frau Muller
Agnes Muller
Man with White Feather
Angry Protestor (uncredited)
(uncredited)
Raymond Lodge (uncredited)
Barman (uncredited)
Traveller (uncredited)