The Monster That Challenged the World
1957, directed by Arnold Laven
(IMDB Link) IMDB Summary: Giant mollusk monsters attack California.
- 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
- 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)