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Shriek of the Mutilated is one of the great drive-in films of all time. It symbolizes the perfect 1970's independent horror film - cheap, gruesome and unerringly fantastic, with plot twists and imagery that stay long in memory - in this case, a result of the meeting of several great filmmakers, who pooled their particular talents to create what might be considered a "hybrid" of various earlier grindhouse/drive-in genres, including speculative documentary, horror, and sexploitation. Indeed, the mastermind behind Shriek may be its director, Michael Findlay who, along with his wife Roberta, created some of the most notorious and successful sexploitation "roughies" of the 1960s, including the infamous "Flesh" trilogy starring Findlay as the quintessential one-eyed misogynist, Richard Jenkins. Shriek shows that Findlay had a flair for horror and suspense as well, and in harness to his wife's astute cinematography, managed to create a film which, although not in his usual genre, stands above all his others as his inarguable masterpiece.
Much credit must also go to producer/screenwriter Ed Adlum, who in addition to concocting the hare-brained scenario with Ed Kelleher, gave the Findlays free reign to film the screenplay in their own inimitable style. Yet Adlum's presence can be felt throughout Shriek, which shares stunning narrative and aesthetic similarities to his earlier drive-in smash, Invasion of the Blood Farmers (1972). In both films, a rural New York community is invaded by a killing satanic cult! In Farmers it's druids, in Shriek it's cannibals, but the effect is largely the same. Also, both films share a marvelous depiction of suburbia as it edges towards the rural wilderness, and both films are remarkably attractive in their capturing of the natural beauty of the surroundings, tainted by human evil and savagery.