Prot (Kevin Spacey) is a mental patient who is an alien, visiting Earth from a planet called K-Pax. His doctor (Jeff Bridges) sets out to cure Prot of his illusions, but Prot's conviction is inspiring, and his messianic qualities start to uplift his fellow patients. The baffled doctor must figure out exactly who this man is and what he's doing here. Includes: audio commentary by director Iain Softly, making-of, deleted footage with commentary plus director's preferred alternate ending.