

09/02/1953
A secret jet aircraft capable of traveling three times the speed of sound is being developed by a group of scientists. On the day of the test flight, one of the scientists dies in a mysterious accident, and there are many arguments concerning the flight itself; some think it should be ground-controlled while Heathley (James Donald) wants it to be a manned flight with himself at the controls. Conflict also arises when one of his fellow scientists, taking advantage of Heathley's lack of attention toward his wife, Lydia (Phyllis Calvert), makes some moves on her. Then there is the question of just who is the enemy agent on the project.

James Donald
as Michael Heathley

Phyllis Calvert
as Lydia Heathley

Noel Willman
as Dr. Dennis Bord

Herbert Lom
as Dr. Alex Leon

Robert Beatty
as Maj. Sam Seagram

Patric Doonan
as Brian Jackson

Walter Fitzgerald
as Sir Charles Craddock

Muriel Pavlow
as Caroline Cartier

Maurice Denham
as Prof. Carrington

Marjorie Fielding
as Michael's Mother

Herbert Lomas
as George Jackson

Geoffrey Denton
as Fisher

Cyril Chamberlain
as Inspector Carter

Hal Osmond
as Agent Lawson

Caven Watson
as Dr. Ferguson

Marianne Stone
as Maisie

Stanley Maxted
as Prof. Adams

Hartley Power
as General Adams (uncredited)

Philip Ray
as Sentry (uncredited)

Johnnie Schofield
as Jim Barnes (uncredited)

John Warren
as Ted (uncredited)
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