First, let me assure you that I am alive and well. Marty: "Dear Marty, if my calculations are correct, you will receive this letter immediately after you saw the DeLorean struck by lightning. Maybe again we'll bump into each other sometime in the future. Now, why don't you make like a tree and get outta here? Old Biff: It's "leave", you idiot! "Make like a tree, and leave"! You sound like a damn fool when you say it wrong! Young Biff: All right, then! Leave! And take your book with you!ġ955 Doc: It was nice talking to you. ~ 1955 Biff Tannen Old Biff: The information in here is worth millions. In order to put the universe back as we remember it and get back to our reality, we have to find out the exact date and specific circumstances of how, when, and where young Biff got his hands on that sports almanac. Our only chance to repair the present is in the past, at the point where the timeline skewed into this tangent. Doc: We can't, because if we travel into the future from this point in time, it will be the future of this reality, in which Biff is corrupt, powerful, and married to your mother, and in which this has happened to me! No. Marty: So we go back to the future, and we stop Biff from stealing the time machine. 1985 Jennifer: I'm old! 2015 Jennifer: I'm young! The destruction might in fact be very localised, limited to merely our own galaxy. Or 2: the encounter could create a time paradox, the result of which could cause a chain reaction that would unravel the very fabric of the spacetime continuum and destroy the entire universe! Granted, that's a worst-case scenario. 1: coming face to face with herself 30 years older would put her into shock and she'd simply pass out. That could result in a Great Scott! Jennifer could conceivably encounter her future self! The consequences of that could be disastrous! Marty: Doc, what do you mean? Doc: I foresee two possibilities. Marty: You mean, I'm gonna see where I live? I'm gonna see myself as an old man? Doc: No, no, no, Marty. Doc: They're taking her home, to your future home! We'll arrive shortly thereafter, get her out of there, and go back to 1985. ~ Griff's friends Data: Hey, McFly, you bojo! Those boards don't work on water! Whitey: Unless you've got power!