place against the unified backdrop which has come to be known as the Cthulhu Mythos . Frequent references are made to the Necronomicon , the Old Ones , and Yog Sothoth throughout the film. Link here: http://en.wikipedia.org/wiki/Cast_a_Deadly_Spell To learn more about Cthulhu, please check out this link: http://en.wikipedia.org/wiki/Cthulhu Have a great Tuesday!