Kenneth More

Richard Hannay

Taina Elg

Miss Fisher

Brenda De Banzie

Nellie Lumsden

Barry Jones

Professor Arthur Logan

Reginald Beckwith

Lumdsen

Faith Brook

Mandy Robinson ("Nannie")

Michael Goodliffe

Brown

James Hayter

Mr Memory

Duncan Lamont

Jameson Clark

MacDougal

Andrew Cruickshank

Sheriff

Leslie Dwyer

Milkman

Joan Hickson

Miss Dobson

Sid James

Perce Baker

Brian Oulton

Barbara Steele

Extra

Marianne Stone

Hospital Administrator (uncredited)

Jill Haworth

Schoolgirl on Train (uncredited)

Peter Vaughan

2nd Police Constable on Train (uncredited)

Carol White

Schoolgirl in Assembly Hall (uncredited)

Sam Kydd

Train restaurant staff (uncredited)

Michael Brennan

Detective on Train (uncredited)

Bruce Seton

Policeman on Train (uncredited)