2. John Carpenter's The Thing
Sadly without Del Toro's At The Mountains Of Madness the closest we will ever get to a cinematic treatment of that story is the first movie in Carpenter's Apocalypse Trilogy. Though not directly a Lovecraft story and in fact a remake of an entirely separate tale; The Thing actually plays out very like the first few chapters of At The Mountains of Madness. Whereas Lovecraft's tale comes to deal with a formless creature; the Shoggoth, Carpenter takes that amorphousness one step further making it a shape shifter with a gift for mimicry. Once again this film is a testament to the pre CGI days of special effects, and if the recent prequel serves to prove anything it is this; when it comes to a movie like The Thing CGI really doesn't cut the mustard compared to prosthetics and animatronics when portraying the disturbingly horrific and utterly alien.