- Ishirô Hondadirector (earlier film clips) (uncredited)
- Charles Bennettscreenplay and
- Louis M. Heywardscreenplay
- Edgar Allan Poebased on "City in the Sea"
- David Whitakeradditional dialogue (as David Whittaker)
- H.P. Lovecraftbased on the book by (uncredited)
Cast
(in credits order) verified as complete
- Henry Oscar(as Harry Oscar)
Rest of cast listed alphabetically
- Bart Allison(uncredited)
- John Barrett(uncredited)
- Dennis Blake(uncredited)
- Steven Brooke(uncredited)
- Barbara Bruce(uncredited)
- Arthur Hewlett(uncredited)
- Michael Heyland(uncredited)
- William Hurndell(uncredited)
- George Ricarde(uncredited)
- Tony Selby(uncredited)
- Walter Sparrow(uncredited)
- Jim Spearman(uncredited)
- Samuel Z. Arkoffexecutive producer (uncredited)
- Daniel Hallerproducer
- Stuart Levyexecutive producer (uncredited)
- James H. Nicholsonexecutive producer (uncredited)
- George Willoughbyexecutive producer / producer (uncredited)
- Stephen Dadecinematographer (photographed by)
- Frank Whiteart director (art direction by)
- Elsie Alderhairdresser
- W.T. Partletonmakeup artist (as Bill Partleton)
- Geoffrey Rodwaymakeup artist (as Geoff Rodway)
- David Tringhamassistant director
- Leon Davisconstruction manager
- Colin Southcottset dresser
- Peter Woodscenic artist
- C. Le Mesuriersound (as C. Le Messurier)
- Allan Morrisondubbing editor
- Frank Georgespecial effects
- Eiji Tsuburayadirector of special effects: footage taken from the Toho production "Atragon" (uncredited)
- Ronnie Maaszcamera operator
- Ginger Gemmelunderwater photographer (uncredited)
- Ernie Farrerwardrobe supervisor
- Samuel Z. Arkoffpresenter: US version
- Stuart Levypresenter
- James H. Nicholsonpresenter: US version
- Reynold Brownmovie poster art (uncredited)
Crew believed to be complete
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