

Giants Mollusks are released from the earth by an earthquake and start killing people.

Lt. Cmdr. John 'Twill' Twillinger

Gail MacKenzie

Dr. Jess Rogers

Jody Simms

Dr. Tad Johns

Lt. Robert 'Clem' Clemens

Sheriff Josh Peters

Sandy MacKenzie
Connie Blake

Seaman Fred Johnson

Sally
George Blake (lab assistant)

Mrs. Simms

Lewis Clark Dobbs

Seaman Wyatt (Radioman)
Seaman Morty Beatty
Monster Victim
Deputy Larry

Admiral Greenhouse
Deputy Scotty

Other Lock Watchman

Boy with Morty's Cap
Coroner Nate Brown
Gatekeeper

Patterson

Watchman at Lock 57

Seaman Howard Sanders

Davis - Resort Owner

Captain Masters
Deputy Brewer
Clarke
Story
Director
Conductor
Production Assistant
Sound Recordist
Sound Recordist

Producer
Screenplay
Casting
Special Effects
Director of Photography
Art Direction
Producer
Editor
Original Music Composer
Set Decoration
Other
Hairstylist
Other
Wardrobe Supervisor
Technical Supervisor
Other
Underwater Director of Photography
Makeup Artist
Music Director
Sound Mixer
Assistant Director
Other
Sound Recordist