Heavy Metal is one of the worst ideas ever to be translated into a movie. [8 Aug 1981, p.C10]
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What are critics saying?
The film never transcends the racist, sexist, neofascist implications of its base material, but it works entertainingly within them, and even manages a bit of auto-analysis in John Candy's ironic, adolescent narration of the "Den" episode. Better than it had to be, for which some honor is due.
That it is a cartoon that takes kids right out of the equation is the best recommendation of all.
The New York Times by Janet Maslin
For anyone who doesn't think an hour and a half is a long time to spend with a comic book, Heavy Metal is impressive. Though it owes some slight bit of its toughness and nihilism to Ralph Bakshi, this animated feature is off on its own track, combining science fiction, mysticism, sex, violence and rock music. Much of the time, these elements do what the film makers want them to, and make for a heady mix.
Austin Chronicle by Marc Savlov
A genuinely outrageous and occasionally brilliant coupling of American animation and classic early-Eighties heavy metal (does anybody even remember Riggs and Trust?).