
Professor Barring is awarded the Nobel Prize in physics. According to Barring the scientist's sole duty is to seek the truth, even if this leads to the "gates of hell".

Lars Hanson
Victor Barring

Gunnel Broström
Eva Barring

Olof Bergström
Arne Hedberg

Nils Dahlgren
Harald Barring

Anna Lindahl
Margit Barring

Arne Ragneborn
Bengt

Georg Funkquist
Dr. Kanzel

Wiktor Andersson
Ekman

David Erikson
Ewers
Erik Rosén
Chief Physician

Magnus Kesster
Kanzel's Henchman

Harry Ahlin
Kanzel's Henchman

Sven Bergvall
Member of Royal Academy of Sciences

Britta Billsten
Lab Assistant (uncredited)

Erland Colliander
Man at the Peace Meeting (uncredited)