- Unknown:
- Vladimir Dudintsev
- Translated By:
- Dr. Edith Bone
- Broadcasting By:
- David Tutaev
- Produced By:
- John Gibson
- Leonid Drozdov, General Manager:
- John Gabriel
- Nadia, his wife:
- Renee Goddard
- Shura their servant:
- Beryl Calder
- Ganichev, a chief engineer:
- Philip Cunningham
- Mrs Ganichev, his wife:
- Ella Milne
- Samsonov a Party Official:
- David March
- Maxiutenko, an engineer:
- Harold Lang
- Dimitri Lopatkin, an inventor:
- Michael Gwynn
- Sianov a worker:
- Arthur Young
- Valentina Pavlova, a schoolmistress:
- Sheila Manahan
- Uruipin, an engineer:
- Frank Partington
- Nievrayev:
- Charles Kay
- Galitsky, a Doctor of Science:
- Frank Windsor
- Shutikov, a Deputy Minister:
- Will Leighton
- Bussko, a disappointed inventor:
- Carleton Hobbs
- Prosecutor:
- Ian Lubbock
- Major Badyin:
- John Graham