"The Monster That Challenged the World" is a 1957 horror / science fiction movie of when horde of prehistoric mollusk monsters enter the canal system of the California's Imperial Valley and ... Read all"The Monster That Challenged the World" is a 1957 horror / science fiction movie of when horde of prehistoric mollusk monsters enter the canal system of the California's Imperial Valley and terrorize the populace."The Monster That Challenged the World" is a 1957 horror / science fiction movie of when horde of prehistoric mollusk monsters enter the canal system of the California's Imperial Valley and terrorize the populace.