- Writer:
- George F. Kerr
- From the novel "Hero's Walk" by:
- Robert Crane
- Producer:
- Dennis Vance
- Dr. Werner, President of InterCos:
- Walter Rilla
- Helga von Horstmann, his aide:
- Ursula Danera
- Crandall, U.S.A.:
- Launce Maraschal
- Vernon-Cavendish, U.K. and Eire:
- Carl Bernard
- Sir Alton Berkeley, U.K. and Eire:
- Fred Johnson
- Neil Harrison, U.K. and Eire:
- Terence Alexander
- Balatov, U.S.S.R.:
- Stanley Zevic
- Hsuan, China:
- Andy Ho
- Dhevu, India:
- Paul Bahadur
- Libby Harrison, Mark's wife:
- Ursula Howells
- Professor Mark Harrison:
- Willoughby Goddard
- Dr. Wooley:
- Kevin Stoney
- Dr. Luden:
- Barry Letts
- Waterson, Australia:
- Bettina Dickson
- McAllister, Canada:
- Ronan O'Casey
- Locke, New Zealand:
- Vincent Ball
- Admiral Gould:
- Peter Bathurst
- General Kirkland:
- Harold Ayer
- Hadfleld:
- Paul Hardwick
- Others taking part:
- Joan Angell
- Others taking part:
- Joyce Chancellor
- Others taking part:
- Sheila Chong
- Others taking part:
- John Dunbar
- Others taking part:
- Mary Gillingham
- Others taking part:
- Harcourt Curacao
- Others taking part:
- Patricia Horder
- Others taking part:
- Arthur Hosking
- Others taking part:
- Guy Mills
- Others taking part:
- Liat Sahani
- Others taking part:
- Frank Singuineau
- Others taking part:
- Jill Rowland
- Others taking part:
- Joy Stewart
- Others taking part:
- Veronica Wells
- Others taking part:
- Felicitas Cottier
- Others taking part:
- Monti de Lyle
