What is it?
The 1986 American science fiction adventure film Flight Of The Navigator.
This is how Rotten Tomatoes describes this movie:
The year is 1978: 12-year-old David Freeman (Joey Cramer), playing in the woods near his home, is knocked unconscious.
He awakens and heads home, only to find strangers living there.
He also finds that the year is 1986, and that he’s been officially missing for eight years.
NASA officials determine that David was abducted by aliens during his blackout, and hope to scan the boy’s brain in order to unlock a few secrets of the universe.
Answering the call of a strange, unseen force, David boards a well-hidden spaceship and takes off, guided by the jocular voice of a computer named MAX (voiced by none other than Paul Reubens, aka Pee-Wee Herman).
Realizing that he can’t fit in to 1986 so long as he’s a child of the ’70s, David hopes to retrace the steps of his alien abductors and get back to his own time.