- Writer:
- Antony Jay
- Narrator:
- Rene Cutforth
- Interviewer:
- Stephen Black
- Taking part:
- Harold Agnew
- Taking part:
- Otto R. Frisch
- Taking part:
- Sam Goudsmit
- Taking part:
- Leslie R. Groves
- Taking part:
- Fritz Houtermans
- Taking part:
- J. Robert Oppenheimer
- Taking part:
- Joseph Rotblat
- Taking part:
- Emilio Segre
- Taking part:
- Edward Teller
- Taking part:
- James Tuck
- Taking part:
- Carl von Weizsacker
- Music:
- The BBC Radiophonic Workshop
- Research:
- Robyn Mendelsohn
- Cameraman:
- Eugene Carr
- Cameraman:
- Tony Leggo
- Sound Recordist:
- George Cassidy
- Sound Recordist:
- Graham Whatling
- Dubbing Mixer:
- Brian Watkins
- Film Editor:
- Ted Walter
- Assistant Producer:
- Richard Thomas
- Producer:
- R.W. Reid