character - Gallery Visitor

character - Winston Churchill

character - Bob Fisher

character - Lionel

character - Minister

character - Sam

character - Premier Graham Berry

character - John Conroy

character - Martin

character - Older David Collins

character - Edward Brooks

character - Cyril

character - Andreas Borg

character - Professor Alan Nordstrum

character - Self

character - Farmer

character - Country Doctor

character - Dr Harry McKay

character - Lawrence Hammill

character - Old Stanley

character - Narrator (voice)

character - Governor

character - Hayes

character - Bert Clarke

character - Derek

character - Charles

character - Muirhead

character - Dr. Rayment

character - Max Bell

character - Host

character - Stewart Simpson Sr.

character - Justice Masters

character - Tramways supervisor

character - Felix

character - Hughie Geddes

character - Narrator

character - Helen's Father

character - Uncle Charles

character - Cassidy

character - The Headmaster

character - International Space Control Commander (voice)

character - Lieutenant Dean / Carter (voice)

character - Lt. Col. Denny

character - Lieutenant Dean / Captain Brown / Agent 042 / Various Characters (voice)

character - Sid Mitchell

character - Jack Henderson

character - Dr. Baker

character - Harry Ferguson

character - Dr. Miller

character - Duncan Fraser

character - Dr. Hammond / Quiz Host

character - Doctor (uncredited)

character - Redwood

character - Dr. Fairburn

character - Father

character - Captain Beaver James

character - John Mitchell

character - Mr. Bennet

character - Jacko

character - David Soames

character - Captain Brown / Lieutenant Dean / Helicopter A42 Pilot (voice)

character - Doctor Fawn / Captain Brown / Airport Operator / Agent 042 (voice)

character - Macy (voice)

character - Harris (voice)

character - Marshall (voice)

character - Lieutenant Belmont (voice)

character - Doctor Fawn / Morgan (voice)

character - Space General Paterson (voice)

character - Captain Hassel (voice)

character - Fairfield (voice)

character - Base Controller (voice)

character - Carter (voice)

character - Lieutenant Dean (voice)

character - Helicopter A42 Pilot (voice)

character - Macey / 4th Policeman (voice)

character - Dr. Tony Grant / Angry Young Man / Public Relations Officer (voice)

character - Cpt. Dantor

character - Alan Kent

character - Captain Jaffe

character - Captain Jaffe

character - Major Dryden

character - Insp. Reg Lawson

character - Inspector Craddock

character - Inspector Craddock

character - Inspector Craddock

character - Inspector Craddock

character - Dr. Neville

character - Conway

character - Capt. Braddock

character - Luke Parker

character - Alan Dawson

character - Jim Muldoon

character - Doctor Alan Dawson

character - Mr. Stevens

character - Peter Merriman

character - Lt. Harry Carstairs

character - Alan Blake

character - Matt

character - Narrator

character - John King

character - Sam Curzon

character - Terry Regan