Prot is a patient at a mental hospital who claims to be from a far away Planet. His psychiatrist tries to help him, only to begin to doubt his own explanations.
The movie itself is not completely successful, but it's consistently both engrossing and entertaining, and -- once again -- Spacey's performance creates a spell that lingers long after the lights come back on.
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Wall Street Journal
Joe Morgenstern
When Kevin Spacey takes center stage, our planet really does seem bright.
I rather like the whole mystic- crystal-revelations aspect of K-PAX, and the idea that even a psychiatrist of Jeff Bridges' handsome, American substantiality is open to notions of cosmic improbability.