Paul Carpenter
— Val Neal
Patricia Roc
— Mary Foster
Roland Culver
— Dr. Francis Pelham
William Hartnell
— Inspector Ross
Gordon Boyd
— Detective Sergeant Davis
Edgar Driver
— Atkins
Tom Tann
— Wang
Ellen Pollock
— Miss Barbara Barton
Robert Sansom
— Senior Test Flight Official
Martin Wyldeck
— Dr. Bradford
John Serret
— Dr. Martin
Oliver Johnston
— Dr. Kenyon
Kay Callard
— Susie