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The Monster That Challenged the World
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Directed by
Arnold Laven 
 
Writing credits
David Duncan (story)

Pat Fielder (writer)

Cast (in credits order) verified as complete

Tim Holt ... Lt. Cmdr. John 'Twill' Twillinger
Audrey Dalton ... Gail MacKenzie
Hans Conried ... Dr. Jess Rogers
Harlan Warde ... Lt. Robert 'Clem' Clemens
Max Showalter ... Dr. Tad Johns (as Casey Adams)
Mimi Gibson ... Sandy MacKenzie
Gordon Jones ... Sheriff Josh Peters
Marjorie Stapp ... Connie Blake
Dennis McCarthy ... George Blake (lab assistant)
Barbara Darrow ... Jody Simms
Robert Benevides ... Seaman Morty Beatty (as Bob Beneveds)
Michael Dugan ... Clarke
Mack Williams ... Capt. Masters
Wallace Earl ... Sally (as Eileen Harley)
Jody McCrea ... Seaman Fred Johnson
William Swan ... Seaman Howard Sanders
Charles Tannen ... Seaman Wyatt (radioman)
Byron Kane ... Coroner Nate Brown
Hal Taggart ... Davis, the resort owner
Gil Frye ... Deputy Scotty
Dan Gachman ... Deputy Brewer
Milton Parsons ... Lewis Clark Dobbs
Ralph Moody ... Watchman at Lock 57
rest of cast listed alphabetically:
John Carlyle ... Monster Victim (uncredited)
John Close ... Deputy Larry (uncredited)
William Forrest ... Admiral Greenhouse (uncredited)
Joseph Hamilton ... The Other Lock Watchman (uncredited)
Charles Herbert ... Boy with Morty's Cap (uncredited)
Ralph Littlefield ... Gatekeeper (uncredited)

David McMahon ... Patterson (uncredited)
Sarah Selby ... Mrs. Simms, Jody's mother (uncredited)
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Produced by
Arthur Gardner .... producer
Jules V. Levy .... producer
 
Original Music by
Heinz Roemheld 
 
Cinematography by
Lester White 
 
Film Editing by
John Faure  (as John D. Faure)
 
Casting by
Kerwin Coughlin 
 
Art Direction by
James Dowell Vance  (as James Vance)
 
Set Decoration by
Rudy Butler 
 
Makeup Department
Abe Haberman .... makeup artist
Olga Collings .... hair stylist (uncredited)
 
Second Unit Director or Assistant Director
Paul Stader .... underwater unit director
Maurice Vaccarino .... assistant director
 
Sound Department
Charles Althouse .... sound recordist
Joel Moss .... sound recordist
B.F. Remmington .... sound recordist (uncredited)
 
Special Effects by
Robert H. Crandall .... special effects photographer
Ted Haworth .... special effects design
Augie Lohman .... special effects (as August Lohman)
 
Camera and Electrical Department
Scotty Welbourne .... photographer: underwater unit (as Charles S. Welborn)
Paul Eagler .... process photographer (uncredited)
 
Costume and Wardrobe Department
Allan Sloane .... wardrobe supervisor (uncredited)
 
Music Department
Heinz Roemheld .... conductor (uncredited)
 
Other crew
Norman Bishop .... underwater technical advisor
Virginia Mazzuca .... production assistant
Harlan Warde .... dialogue director
Pat Fielder .... production assistant (uncredited)
 
Crew verified as complete

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