Randal Kleiser
In 1978, a boy travels eight years into the future and has an adventure with an intelligent, wisecracking alien ship.
A 12-year-old boy goes missing in 1978, only to reappear once more in 1986. In the eight years that have passed, he hasn't aged. It is no coincidence that at the time he "comes back", a flying saucer is found, entangled in power lines.