Characters played by Gene Evans
Steve Karnes
Characters played by André Morell
Prof. James Bickford
Characters played by John Turner
John Duncan
Characters played by Leigh Madison
Jean Trevethan
Characters played by Jack MacGowran
Dr. Sampson - the Paleontologist
Characters played by Maurice Kaufmann
Mini Submarine Officer
Characters played by Henri Vidon
Tom Trevethan
Characters played by Leonard Sachs
Scientist
Characters played by John Adams
P.C. Spotting Monster
Characters played by Joyce Adams
Laboratory Technician
Characters played by Chris Adcock
Fleeing Man in Crowd
Characters played by Neal Arden
TV Newscaster
Characters played by Jack Armstrong
Police Inspector
Characters played by Michael Beint
Navy Lieutenant
Characters played by Paul Beradi
Man Listening to Car Radio
Characters played by Ernest Blyth
Scientist at Conference on Atomic Research
Characters played by Wallace Bosco
Scientist at Conference on Atomic Research
Characters played by Janet Bradbury
Little Girl
Characters played by Anna Cameron
Recording Secretary at Conference
Characters played by Bill Cummings
Fleeing Man
Characters played by James Dyrenforth
Sir Charles Moore
Characters played by Bill Edwards
Radar Operator
Characters played by Max Faulkner
PLA Radio Operator
Characters played by Norman Fisher
Mourner at Funeral
Characters played by Chick Fowles
Father Listening to Radio
Characters played by Arthur Gomez
Fisherman on Quayside
Characters played by Neil Hallett
Helicopter Pilot
Characters played by Aidan Harrington
Connaught Hotel Guest
Characters played by Reginald Hearne
Police Sergeant Delivering Photo
Characters played by George Holdcroft
Scientist Asking 'Who Is It?'
Characters played by Arthur Howell
Police Officer Using Patrol Car Radio
Characters played by Alastair Hunter
Doctor
Characters played by Ann Jay
Mother Listening to Radio
Characters played by Patrick Jordan
Photo Lab Aide
Characters played by Michael Kelly
Helicopter PB7 Observer
Characters played by Lloyd Lamble
Adm. Summers
Characters played by Howard Lang
Naval Commander
Characters played by Dickey Luck
Ferry Crewman
Characters played by Fred Machon
Scientist at Conference on Atomic Research
Characters played by Jack Mandeville
David McEvoy - Reporter
Characters played by André Maranne
French Radio Officer
Characters played by John More
Army Officer Evacuating Citizens
Characters played by Lola Morice
Barmaid
Characters played by Michael Mulcaster
Fisherman on Quayside
Characters played by Derren Nesbitt
Radio Officer
Characters played by Fred Nicholas
Welder
Characters played by Charles Price
Allison - Marine Guard
Characters played by Ernie Rice
Fleeing Man in Crowd
Characters played by Pat Ryan
Officer in Situation Room
Characters played by Gerik Schjelderup
Norwegian Radio Officer
Characters played by Ian Selby
Connaught Hotel Guest
Characters played by Frank Sieman
Farmer
Characters played by Peter Sinclair
Trawler Captain
Characters played by Julian Somers
Admiral Summers
Characters played by Guy Standeven
Naval Officer in Situation Room
Characters played by Philip Stewart
Scientific Conference Member
Characters played by Jim Tyson
Publican
Characters played by Joe Wadham
Police Driver
Characters played by Georgina Ward
Girl Listening to Car Radio
Characters played by John Wilder
Naval Officer