Flight of the Navigator

On July 4, 1978, in Fort Lauderdale, Florida, 12-year-old David Freeman walks through the woods to pick up his 8-year-old brother, Jeff, from a friend's house when he falls into a ravine after a trick Jeff plays on him and is knocked unconscious. When he revives, eight years have mysteriously passed, and it is now 1986. He has not aged, and his appearance exactly matches his missing child poster. He is reunited with his aged parents and the repentant, now-16-year-old Jeff. Meanwhile, an alien spaceship crashes through power lines and is captured by NASA. Hospital tests on David's brainwaves reveal matching images of the spacecraft and a map of its galaxy origins. Dr. Louis Faraday, who has been studying it, persuades David to come to a NASA research facility for just 48 hours, promising him they can help learn what happened to him.