Build a movie plot around this: Who does Marty switch places with in the beginning? His son
A:
The movie opens where Back to the Future left off: October 26, 1985. Marty (Michael J. Fox) opens the garage door and sees his 4X4, the one he longed for in Back to the Future. Jennifer Parker (now played by Elisabeth Shue) asks for a ride. Marty tells her that she is a sight for sore eyes, and wants to look at her. She says that he's acting like he hasn't seen her for a week. She asks if he's OK. When he sees his mom and dad, he says yeah.As they are about to kiss, there are three sonic booms and the DeLorean appears and screeches to a stop in the driveway. Doc (Christopher Lloyd) jumps out and smashes into one of the trash cans. He frantically tells Marty that he has to come back with him. Marty sees his strange goggles and asks, "Where?" Doc answers, "Back to the future!" Doc rummages in the garbage can, and then grabs some banana peels and a discarded beer can. Marty asks him what he's doing, and Doc hastily claims he needs fuel. He opens the attached Mr. Fusion Home Energy Reactor, and puts the banana peels in, topping it off with the beer can and the leftover beer inside it. Doc tells Marty to get in the car, but Marty protests, saying he just got here, and Jennifer and he are going to take the new truck for a spin. Doc tells Marty that they'll take her along, because this concerns her too.Marty wonders what happens to them in the future, Doc hesitates for a moment, before replying that they come out fine, but that something has to be done about their kids. After they get in, and Doc backs up into the street, Marty tells Doc that he had better back up, because they don't have enough road on the street to get up to 88 MPH. Doc quips, "Roads? Where we're going, we don't need roads." As Doc is starting up the car, Biff Tannen (Thomas F. Wilson) comes out of the house, and wants to show Marty the matchbooks he just got printed up for his auto detailing service, just in time to see the DeLorean fly away and vanish in a flash of light. "A flying DeLorean?" he asks, in disbelief.They reappear in the year 2015,...