Set in German-occupied Norway, resistance fighter Knut Straud enlists the reluctant physicist Rolf Pedersen in an effort to destroy the German heavy water production plant in rural Telemark.
Kirk Douglas
as Dr. Rolf Pedersen
Richard Harris
as Knut Straud
Ulla Jacobsson
as Anna Pedersen
Michael Redgrave
as Uncle
David Weston
as Arne
Anton Diffring
as Major Frick
Eric Porter
as Terboven
Mervyn Johns
as Col. Wilkinson
Jennifer Hilary
as Sigrid
Roy Dotrice
as Jensen
Barry Jones
as Professor Logan
Ralph Michael
as Nilssen
