David Malone

Himself - Narrator (voice)

Geraldine James

Maria Skłodowska-Curie's letters read by

Marie Curie

Herself (archive footage)

Julie Des Jardins

Herself - Author: 'The Madam Curie Complex'

Patricia Fara

Herself - Clare College, Cambridge

Malgorzata Sobieszczak-Marciniak

Herself - Maria Skłodowska-Curie Museum, Warsaw

Teresa Kaczorowska

Herself - Journalist and Author

Renaud Huynh

Himself - Musée Curie, Paris

Andrea Sella

Himself - University College, London

Hélène Langevin-Joliot

Herself - Maria Skłodowska-Curie's Granddaughter