All Cast
Dana Andrews
Dr. John Holden
Peggy Cummins
Joanna Harrington
Niall MacGinnis
Dr. Julian Karswell
Maurice Denham
Professor Henry Harrington
Athene Seyler
Mrs. Karswell
Liam Redmond
Professor Mark O'Brien
Reginald Beckwith
Mr. Meek
Ewan Roberts
Lloyd Williamson
Peter Elliott
Professor K.T. Kumar
Rosamund Greenwood
Mrs. Meek
Brian Wilde
Rand Hobart
Richard Leech
Inspector Mottrarn
Lloyd Lamble
Detective Simmons
Peter Hobbes
Superintendent
Charles Lloyd Pack
Chemist
John Salew
Librarian
Janet Barrow
Mrs. Hobart
Percy Herbert
Farmer
Lynn Tracy
Air Hostess
John Harvey
Hobart's Brother
Alan Beaton
Hyma Beckley
Ballard Berkeley
Ernest Blyth
Wallace Bosco
Daniel Brown
Jimmy Cains
George Curtis
Richard Duke
Shay Gorman
Laurence Hepworth
Walter Horsbrugh
Arthur Howell
Anthony John
Dan Lester
Leonard Llewellyn
Michael Peake
Paul Phillips
Anthony Richmond
Peggy Scott Sanders
Terry Sartain
Leonard Sharp
Bert Simms