A scientist is persuaded by the government to inject himself with the brain fluid of a dying colleague in order to preserve missile-defense secrets. However, he finds that he is now torn between his own wife and that of his dead colleague, who was a Nazi sympathizer.
David McCallum
as Hillel Mondoro
Susan Strasberg
as Karen Mondoro
Helmut Käutner
as Dr. Kramer
Lilli Palmer
as Anna Hauser
Leslie Nielsen
as Joseph Slaughter
Herbert Fleischmann
as Werner Renner
Hans Elwenspoek
as Van Kungen
Barbara Lass
as Angelika
Arthur Brauss
as Bak
Robert Webber
as Dorsey
Günter Meisner
as Koroweiw
Peter Capell
as Dr. Shepilov
