- Kenneth More
- Richard Hannay
- Taina Elg
- Fisher
- Brenda de Banzie
- Nellie Lumsden
- Barry Jones
- Professor Logan
- Reginald Beckwith
- Lumsden
- Faith Brook
- Nannie
- Michael Goodliffe
- Brown
- James Hayter
- Mr. Memory
- Duncan Lamont
- Kennedy
- Jameson Clark
- McDougal
- Andrew Cruickshank
- Sheriff
- Leslie Dwyer
- Milkman
- Betty Henderson
- Mrs. McDougal
- Joan Hickson
- Miss Dobson
- Sidney James
- Perce
- Brian Oulton
- Mr. Pringle
- John Adams
- Constable
- Margot Boyd
- Headmistress at St. Catherines
- Michael Brennan
- Detective on Train
- Victor Brooks
- Policeman at Accident
- Pamela Chamberlain
- Young Lady in Park
- Mike Conner
- Detective
- James Copeland
- Police Constable at Roadblock
- Dan Darnelli
- Man in Audience
- David Davies
- Theatre Commissioner
- Ursula Granville
- Lady in Audience
- John Grieve
- Lowrie - Sheep Herder
- Victor Hagan
- Man in Audience
- Aidan Harrington
- Cyclist
- Victor Harrington
- Questioner at Mr Memory Show
- Victoria Harrington
- Child
- John Harvey
- Detective at Theatre
- Jeremy Hawk
- Theatre Compere
- Jill Haworth
- Schoolgirl on Train
- Eric Henderson
- Train Passenger
- Robert S. Holman
- One of Two Cockney Boys
- George Howell
- Boy in Audience
- Sam Kydd
- Train Steward
- Avice Landone
- Louisa
- Martin Lyder
- Man in Audience
- William Mervyn
- Angry Train Passenger
- Hal Osmond
- Stage Manager
- John Richardson
- (uncredited)
- Anthony Sagar
- Demolition Workman
- Bruce Seton
- Policeman on Train
- Barbara Shotter
- Bit Part
- Bill Simpson
- Groom
- John Snagge
- BBC Newsreader
- George Spence
- Man in Audience
- Barbara Steele
- Extra
- Marianne Stone
- Hospital Administrator
- Susan Stranks
- Schoolgirl on Train
- Reg Thomason
- Man in Audience
- Hilary Tindall
- Monica (Schoolgirl on train)
- Harry Towb
- Harold
- Peter Vaughan
- 2nd Police Constable on Train
- Robert Vossler
- Constable
- Eric Wetherell
- Man in Audience
- Carol White
- Schoolgirl in Assembly Hall
- Winnie Wiblin
- Audience Member
- Vic Wise
- Man in Theatre Who Wants an Interval Drink
- Margaret Withers
- Teacher at St. Catherines
- Johnny Wyne
- Constable
