Cast 31

  1. Tim Holt

    Tim Holt

    Lt. Cmdr. John 'Twill' Twillinger

  2. Audrey Dalton

    Audrey Dalton

    Gail MacKenzie

  3. Hans Conried

    Hans Conried

    Dr. Jess Rogers

  4. Barbara Darrow

    Barbara Darrow

    Jody Simms

  5. Max Showalter

    Max Showalter

    Dr. Tad Johns

  6. Harlan Warde

    Harlan Warde

    Lt. Robert 'Clem' Clemens

  7. Gordon Jones

    Gordon Jones

    Sheriff Josh Peters

  8. Mimi Gibson

    Mimi Gibson

    Sandy MacKenzie

  9. Marjorie Stapp

    Connie Blake

  10. Jody McCrea

    Jody McCrea

    Seaman Fred Johnson

  11. Wallace Earl

    Wallace Earl

    Sally

  12. Dennis McCarthy

    George Blake (lab assistant)

  13. Sarah Selby

    Sarah Selby

    Mrs. Simms

  14. Milton Parsons

    Milton Parsons

    Lewis Clark Dobbs

  15. Charles Tannen

    Charles Tannen

    Seaman Wyatt (Radioman)

  16. Robert Benevides

    Seaman Morty Beatty

  17. John Carlyle

    Monster Victim

  18. John Close

    Deputy Larry

  19. William Forrest

    William Forrest

    Admiral Greenhouse

  20. Gil Frye

    Deputy Scotty

  21. Joseph Hamilton

    Joseph Hamilton

    Other Lock Watchman

  22. Charles Herbert

    Charles Herbert

    Boy with Morty's Cap

  23. Byron Kane

    Byron Kane

    Coroner Nate Brown

  24. Ralph Littlefield

    Gatekeeper

  25. David McMahon

    David McMahon

    Patterson

  26. Ralph Moody

    Ralph Moody

    Watchman at Lock 57

  27. William Swan

    William Swan

    Seaman Howard Sanders

  28. Hal Taggart

    Hal Taggart

    Davis - Resort Owner

  29. Mack Williams

    Mack Williams

    Captain Masters

  30. Dan Gachman

    Deputy Brewer

  31. Michael Dugan

    Clarke

Crew 26

Art

  1. James Dowell Vance

    Art Direction

  2. Rudy Butler

    Set Decoration

Camera

  1. Lester White

    Director of Photography

  2. Paul Eagler

    Other

  3. Scotty Welbourne

    Underwater Director of Photography

Costume & Makeup

  1. Olga Collings

    Hairstylist

  2. Abe Haberman

    Makeup Artist

  3. Allen Sloane

    Wardrobe Supervisor

Crew

  1. Ted Haworth

    Other

  2. Augie Lohman

    Special Effects

  3. Norman Bishop

    Technical Supervisor

Directing

  1. Maurice Vaccarino

    Assistant Director

  2. Arnold Laven

    Director

  3. Paul Stader

    Other

Editing

  1. John Faure

    Editor

Production

  1. Kerwin Coughlin

    Casting

  2. Arthur Gardner

    Producer

  3. Jules V. Levy

    Producer

  4. Virginia Mazzuca

    Production Assistant

Sound

  1. Heinz Roemheld

    Conductor, Music Director, Original Music Composer

  2. Charles Althouse

    Sound Mixer, Sound Recordist

  3. B. F. Remmington

    Sound Recordist

  4. Joel Moss

    Sound Recordist

Writing

  1. Pat Fielder

    Screenplay

  2. David Duncan

    Story

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