Kenneth More

Richard Hannay

Taina Elg

Miss Fisher

James Hayter

Mr Memory

Barry Jones

Professor Arthur Logan

Barbara Steele

Extra

Brenda De Banzie

Nellie Lumsden

Faith Brook

Mandy Robinson ("Nannie")

Joan Hickson

Miss Dobson

Sid James

Perce Baker

Leslie Dwyer

Milkman

Jameson Clark

MacDougal

Betty Henderson

Mrs, MacDougal

Reginald Beckwith

Lumdsen

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)

Bill Simpson

Bridegroom (uncredited)

Sam Kydd

Train restaurant staff (uncredited)

Michael Goodliffe

Brown

Andrew Cruickshank

Sheriff

Michael Brennan

Detective on Train (uncredited)

Bruce Seton

Policeman on Train (uncredited)