Marty: We will, Doc!
Doc: Stand back!
The train doors close.
Doc: All right, boys, buckle up!
Marty: Hey, Doc...where ya going now? Back to the future?
Doc shakes his head and smiles.
Doc: Nope. Already been there!
Doc and family wave at Marty and Jennifer, and they wave back. Then the train's wheels lift up - it's been hover converted! The train flies off, turns around and heads towards the camera before breaking the time barrier.
Cut to a black screen, it's.....
THE END