| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alan J. Adler | Crew | Writing | Story |
Bernadette Ibbetson | Crew | Costume & Make-Up | Hairstylist |
Daniel James | Crew | Writing | Screenplay |
David Diamond | Crew | Production | Producer |
 Desmond Davis | Crew | Camera | Camera Operator |
 Douglas Hickox | Crew | Directing | Director |
Edwin Astley | Crew | Sound | Original Music Composer, Conductor |
 Eugène Lourié | Crew | Writing | Screenplay, Director, Production Design |
Harry White | Crew | Art | Art Direction |
Irving Block | Crew | Crew | Special Effects |
Jack Rabin | Crew | Crew | Special Effects |
Jimmy Evans | Crew | Costume & Make-Up | Makeup Artist |
Ken Hodges | Crew | Camera | Director of Photography |
Louis DeWitt | Crew | Crew | Special Effects |
Pete Peterson | Crew | Crew | Special Effects |
Richard Marden | Crew | Sound | Sound Editor |
Robert Abel | Crew | Writing | Story |
Ted Lloyd | Crew | Production | Producer |
 Willis H. O'Brien | Crew | Crew | Special Effects, Visual Effects |
Kim Mills | Crew | Directing | First Assistant Director |
Lee Doig | Crew | Editing | Editor |
Freda Gibson | Crew | Costume & Make-Up | Wardrobe Master |
Jennifer Herrinshaw | Crew | Directing | Continuity |
Sid Wiles | Crew | Sound | Sound |
Jacques de Lane Lea | Crew | Production | Production Manager |
 Alastair Hunter | Cast | Actor | Dr. C. A. Morris, the village doctor |
 André Maranne | Cast | Actor | French Radio Officer (uncredited) |
 André Morell | Cast | Actor | Prof. James Bickford |
 Derren Nesbitt | Cast | Actor | The Radar Operator, at the radar room (uncredited) |
 Gene Evans | Cast | Actor | Steve Karnes |
Henri Vidon | Cast | Actor | Tom Trevethan |
 Howard Lang | Cast | Actor | Naval Commader, at the "Valkyrie" wreck (uncredited) |
 Jack MacGowran | Cast | Actor | Dr. Sampson, the paleontologist |
 John Turner | Cast | Actor | John |
 Leigh Madison | Cast | Actress | Jean Trevethan |
 Leonard Sachs | Cast | Actor | Dialogue Scientist at Conference (bit) |
 Lloyd Lamble | Cast | Actor | Senior Admiral, at the Admiralty |
 Maurice Kaufmann | Cast | Actor | Mini Submarine Officer |
 Max Faulkner | Cast | Actor | PLA Radio Operator (uncredited) |
Neal Arden | Cast | Actor | TV Newscaster (uncredited) |
 Neil Hallett | Cast | Actor | Dr. Sampson's Helicopter Pilot (uncredited) |
 Patrick Jordan | Cast | Actor | Photo Lab Aide |
Paul Beradi | Cast | Actor | Man Listening to Car Radio (uncredited) |
 Guy Standeven | Cast | Actor | Naval Officer in Situation Room (uncredited) |
Ernest Blyth | Cast | Scientist at Conference (uncredited) | |
| Person | Type | Job | Role(s) |
