The latest UFO, a white globe levitating in a California canyon, is investigated by the Air Force, aided by physicist Karl Sorensen. Just big enough for one "man", the object seems impenetrable, but that night a half-invisible being visits the town, and a strange bundled-up man takes a room at Angela Green's mountain lodge, the investigators' headquarters. Sorensen thinks the Cosmic Man is benevolent, but to the colonel he represents either danger...or military advantage.