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

Rosamund Greenwood

Mrs. Meek

Brian Wilde

Rand Hobart

Richard Leech

Inspector Mottrarn

Lloyd Lamble

Detective Simmons

Charles Lloyd Pack

Chemist

John Salew

Librarian

Percy Herbert

Farmer

John Harvey

Hobart's Brother

Ballard Berkeley

Wallace Bosco

Shay Gorman

Michael Peake