Flight of the Navigator

On 1978, one dark night, little David, a 12-year-old boy who is playing near his house looking for his brother Jeff, takes a fall and is knocked unconscious. Eight years later, or just a moment later, David wakes up, returns home and realizes that his family has moved away and that he has been given up for missing... or dead. Later, David begins to be pursued by NASA, which claims he has been abducted.