Dirk Bogarde

Dr. Henry Laidlaw Longman

Mary Ure

Oonagh Longman

John Clements

Major Hall

Michael Bryant

Dr. Danny Tate

Wendy Craig

Annabella

Harold Goldblatt

Professor Sharpey

Geoffrey Keen

Calder

Terry Palmer

Norman

Norman Bird

Aubrey

Terence Alexander

Rowing Coach (uncredited)

Grace Arnold

Train Passenger (uncredited)

Timothy Beaton

Paul Longman (uncredited)

Elizabeth Counsell

Girl Student on Station (uncredited)

Roger Delgado

Dr. Jean Bonvoulois (uncredited)

Ian Dewar

Crowd Ringleader (uncredited)

Basil Dearden