The Monster That Challenged the World (original filming titles: The Jagged Edge and The Kraken) is a 1957 black-and-white science-fiction monster film from Gramercy Pictures, produced by Arthur Gardner, Jules V. Levy, and Arnold Laven (who also directed), and starring Tim Holt and Audrey Dalton.[1] The film was distributed by United Artists as a double feature with The Vampire. The film concerns an army of giant mollusks that emerge from California's Salton Sea.[2] The Monster That Challenged the World's Gramercy Pictures is not related to the former PolyGram division of the same name.