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The story begins in 1985 with Marty McFly, a normal seventeen years old who lives with his family in the fictional Hill Valley, California. His father is a failed man, shy and with little character, with a poorly paid job where he has to endure the constant abuse of his boss, Biff Tannen, who since high school has made his life miserable.

To prove that the DeLorean really could travel through time, Doc does a first experiment in which he sends his dog Einstein one minute into the future. When the machine disappears from the scene, leaving behind only two long lines of fire like a skid, the scientist celebrates his achievement with tremendous happiness. Later, he explains in more detail to Marty how the machine works, telling him that time travel occurs thanks to a primordial device known as a flux capacitor. [note 2] However, there is a drawback; the flux capacitor requires an amount of electrical energy equivalent to 1.21 jigowatts,[note 3] which is generated by means of a nuclear reaction that generates the dispersion of the temporary flux, which Doc intends to carry out through the use of plutonium. On a small keyboard on the time machine, Doc enters the date November 5, 1955, which turns out to be the day the idea for the capacitor came to mind. After adding the plutonium in a small lead-lined rear compartment, remember to take the extra plutonium with you in order to return. At that moment a group of Libyan terrorists appear on the scene, aboard a VW Kombi, since Doc had stolen the plutonium from them. The Libyans quickly kill Doc with an AK-47, right in front of Marty who watches in amazement from where he is hiding. When they find out, they also try to shoot Marty, but the gun jams. To escape the dangerous encounter Marty gets into the DeLorean and inadvertently accidentally activates the flux capacitor circuits, the vehicle reaches a speed of 88 miles per hour and travels back in time thirty years to the past, specifically to the date Doc previously had fixed with the keyboard.

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After traveling back in time aboard the DeLorean, Marty appears at the Twin Pines Ranch —in 1985 it turns out to be the Twin Pines Mall—, and ends up crashing into the barn of the farm, which causes the family that lives there to wake up alarmed. by the noise and left his home to investigate what had happened. After seeing the young man get out of the DeLorean with his anti-radioactive suit on top, they assume that it is an alien, since the farmer's son brought with him a science fiction comic with a character on the cover similar to him. Then, the farm owner starts to shoot the young man with a shotgun but misses and the latter manages to escape, accidentally running the DeLorean into one of the farm's pine trees. Later, the young man discovers that the shipment of plutonium is running low and decides to hide the DeLorean behind a large sign where his neighborhood Lyon Estates will be located in the future on the outskirts of Hill Valley and heads into the city.

Arriving in Hill Valley, Marty notices several changes from the time he came from. He immediately goes looking for the Doc of that time in order to find out how to return to his original time. However, before he enters a cafe and meets his father as a young man. This leaves the place shortly after being disturbed by Biff. Marty decides to follow him discreetly until he stops in front of a tree, which he climbs to observe with binoculars through his bedroom window a young Lorraine changing her clothes. Suddenly George slips from the tree and falls right into the street, where he is almost hit by a vehicle driven by Lorraine's father, but is saved by Marty, the latter receiving the impact and passing out on the spot. The fact causes a change in the way Lorraine and George met, which goes unnoticed by the young man at first. Lorraine helps him by taking him inside her house to recover from the accident. Upon waking up, he calls him "Calvin Klein" thinking it is his name because he has it engraved on his underwear. They then go to dinner, but when Lorraine tries to seduce Marty, he is completely shaken by the insinuations of what was ultimately his mother, so he chooses to say goodbye to the family and look for Doc. Doc's house, the scientist doesn't believe him about time travel, since by then the idea of ​​the time machine had barely occurred to him. It is not until Marty reveals the way he imagined the condenser that he convinces Doc and decides to help him, indicating that he should not talk to anyone else if he does not want to alter his past and cause changes in his future. Marty pulls out a picture of his belongings showing his family, noticing that his older brother Dave is slowly fading out of the picture, which Doc assumes is because Marty's parents never got married and therefore both Marty and his brothers never existed, so Doc suggests to the young man that they should solve this matter as soon as possible, since his brothers are going to disappear in the order in which they were born and unless Marty repairs the damage, this will be the last. After this, they go to the place where Marty hid the DeLorean and take the vehicle with them to the scientist's laboratory.

Marty tarda un poco en llegar, mientras Doc se encuentra arreglando varios cables para utilizarlos en el DeLorean y llevar a cabo el viaje al futuro. Justo cuando el joven está listo para partir, Doc descubre una carta dentro de su gabardina, en la cual el joven le había escrito los detalles de su futura muerte a manos de los terroristas libios. Doc se rehúsa a disponer de dicha información afirmando que no se debe cambiar la historia y rompe la carta sin haberla leído. En ese momento, las ramas de un árbol se caen sobre el cableado y los desconecta de los terminales, por lo cual Doc pone los restos de la carta dentro de su gabardina y corre para arreglar el desperfecto. Rápidamente el joven intenta hablarle al científico sobre los sucesos futuros, pero su oportunidad se opaca debido a que se agota el tiempo para su regreso y se ve forzado a subir al DeLorean y retirarse al punto de partida establecido cerca de un motel llamado Blue Bird. Al llegar al punto de partida, Marty coloca todo el equipo que el Doc preparo previamente en su laboratorio, el cual enviara la energía del rayo al condensador de flujos para el viaje, pero también empieza a sentirse frustrado por no poder alertar al científico de su inminente muerte a manos de los terroristas libios, pero pronto recuerda que este tiene en su poder la máquina del tiempo, así que como último recurso, Marty decide reconfigurar los circuitos del tiempo para regresar unos diez minutos antes de su partida original en el estacionamiento del Twin Pines Mall y así advertirle al científico antes de que el ataque suceda nuevamente, pero justo en ese momento el DeLorean sufre un desperfecto mecánico y se apaga, provocando que Marty de manera desesperada intente encenderlo nuevamente, antes de que el rayo caiga en la torre del reloj a las 10:04.p. m. como estaba planeado y finalmente consigue arrancarlo a tiempo y acelera el DeLorean a fondo. Por otro lado, Doc sufre una serie de accidentes relacionados con el cableado, pero afortunadamente consigue reconectar los cables a sus respectivos terminales, antes de que el rayo impacte directamente en la torre del reloj a las 10:04.p. m., con lo que consigue que el DeLorean viaje de regreso al futuro.

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Once back in 1985, Marty shows up ten minutes before his original departure, where he quickly tries to go warn the scientist of the impending attack by Libyan terrorists, however the DeLorean shuts down again, having run out of all power in it. time travel.

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Later, Doc takes the young traveler to his house, and then heads to the year 2015. The next morning, Marty realizes that his house is now more different than he remembered, much more luxurious and orderly, where he also realizes that his brother Dave now has a job in an office and his sister looks different too. Shortly after, his parents arrive and he tells them that they look younger and happier than he remembered. Also, Biff arrives, who is now an auto mechanic and rushes to hand him a copy of the science-fiction novel that Marty's father had written. The young man leaves the house and finds a new truck in his garage, the same one he wanted before leaving for the past, and suddenly Jennifer appears and suggests that they both should go out for the first time. But just then, Doc shows up at the DeLorean (which now has a modification that allows it to run on garbage, instead of the plutonium he stole from the Libyan terrorists) and tells them both to come with him immediately, because he warns them that their children will be in trouble in the future. Finally everyone gets into the DeLorean and Marty tells him that there is not enough stretch of street to reach the speed of 88 miles per hour; however, Doc points out that this is not important, since where they are going they do not need them. The car begins to hover in midair, then turns around and disappears into thin air.