"Her name: X-20. Her type: an experimental interceptor. Recent history: a crash landing in the Mojave Desert after a thirty-one hour flight nine hundred miles into space. Incidental data: the ship, with the men who flew her, disappeared from the radar screen for twenty-four hours. [Narration interrupted by character action and dialogue.] But the shrouds that cover mysteries are not always made out of a tarpaulin, as this man will soon find out on the other side of a hospital door."
Three astronauts have returned from this first space flight. Major Gart is hospitalized with a broken leg. The other two, Colonels Harrington and Forbes head for a bar. Harrington gets a strange feeling and calls his parents. They inform him they have no son. Harrington then disappears, with nobody remembering him but Forbes. When Forbes tells Gart what happened, Gart says he doesn't remember Harrington either. Forbes runs out the door screaming, "I don't want this to happen!" When Gart gets to the door, Forbes has disappeared. Then Gart and their ship vanishes, wiping the last evidence of their existence off the face of the Earth."Once upon a time, there was a man named Harrington, a man named Forbes, a man named Gart. They used to exist, but don't any longer. Someone - or something - took them somewhere. At least they are no longer a part of the memory of a man. And as to the X-20 supposed to be housed here in this hangar, this too does not exist. And if any of you have any questions concerning an aircraft and three men who flew her, speak softly of them... and only in the Twilight Zone."