It's Monstrous! It's Challenging! It's "The Monster That Challenged The World" (1957), starring Tim Holt, Audrey Dalton and Hans Conried. Jim explores this MGM offering concerning large prehistoric sea mollusks that threaten the residents living on the coast of the Salton Sea in Southern California. Will man prevail or will the Earth succumb to the giant snails? It's all ahead on this episode of Monster Attack.