Watch K-PAX (2001) HD Full Movie Free on SolarMovie. Watch K-PAX (2001) online free. PROT is a patient at a mental hospital who claims to be from a faraway planet named K-PAX. His psych...PROT is a patient at a mental hospital who claims to be from a faraway planet named K-PAX. His psychiatrist tries to help him, only to begin to doubt his own explanations.