When one student says suspiciously of another, "We don't know what she is - gay, lesbian, or alien," and when problems at school are solved by snorting a home-laboratory-manufactured drug and waving a gun around, you start getting nervous about the messages in director Robert Rodriguez's sci-fi horror set in a high school and apparently based on Jack Finney's The Body Snatchers, but a surprisingly star-studded cast (Usher, Jon Stewart, Selma Hayek, and others) distracts from this irksomeness and lets other aspects of the movie pay effective tribute to the B-grade horror scifi movies of the 50s.
★★☆☆☆
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