It's time for a 1950 cheesy sci-fi monster flick.
This one features giant mollusks arising from the Salton Sea. Tim Holt traded in his cowboy hat and returned to films after five years to make this one. Co-starring Audrey Dalton (My Cousin Rachael, Casanova's Big Night, Mr. Sadonicus), with child actress Mimi Gibson (The Three Faces of Eve, Houseboat, One Hundred and One Dalmatians), noted character actor Hans Conried (The 5,000 Fingers of Dr. T., The Twonky, Horton Hears a Who), film and television supporting actor Harlan Warde (with 216 IMDb credits, mainly in uncredited roles), and Max Showalter (What Price Glory?, Dangerous Crossing, Fate Is the Hunter).
Directed by Arnold Laven (Without Warning!, Vice Squad, Down These Dark Streets). The Screenplay was written by Pat Fielder (The Return of Dracula, The Flame Barrier, The Vampire), from a story by occasional science fiction writer and screenwriter David Duncan (he wrote the English language version of Rodan, 1960's The Time Machine, and co-wrote the screenplay for Fantastic Voyage); Duncan's original title was The Jagged Edge and the flick was renamed The Kraken before the producers finally settled on The Monster That Challenged the World.
Let the cheesiness begin:
https://www.youtube.com/watch?v=w2jHqSzPnw8