[Doc and Marty in the time machine are about to depart from the Alternate 1985]
Doc: Time circuits on.
Marty McFly: What do you mean "Time Curcuits on"? Doc, we're not goin' back now!
Doc: Yep.
Marty McFly: Doc, What about Jennifer? What about Einstein? We can't just leave 'em here.
Doc: Don't worry, Marty. Assuming we succeed in our mission, this alternate 1985 will be changed back into the real 1985, instantaneously transforming around Jennifer and Einie. Jennifer and Einie will be fine, and they will have absolutely no memory of this horrible place.
Marty McFly: Doc... what if we don't succeed?
Doc: We *must* succeed.