An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace.
Audrey Dalton, Barbara Darrow, Byron Kane, Charles Herbert, Charles Tannen, David McMahon, Dennis McCarthy, Gil Frye, Gordon Jones, Hal Taggart, Hans Conried, Harlan Warde, Jody McCrea, John Carlyle, John Close, Joseph Hamilton, Mack Williams, Marjorie Stapp, Max Showalter, Michael Dugan, Milton Parsons, Mimi Gibson, Ralph Littlefield, Ralph Moody, Sara
Horror, Sci-Fi
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