United States Air Force Colonel Clegg Forbes arrives at a military hospital to visit his friend and co-pilot Major William Gart. The two had recently piloted an experimental spaceplane, the X-20 DynaSoar. During their voyage the craft disappeared from radar screens for a full day before reappearing and crash landing in the desert, leaving Gart with a broken leg. Forbes is agitated and asks Gart if he remembers how many people were on the mission. Gart confirms that only he and Forbes piloted the plane, but Forbes insists that a third man – Colonel Ed Harrington, his best friend for 15 years – accompanied them.