Back to the Future is about Mary McFly, a wannabe musician who lives in Hill Valley, California. He has a girlfriend named Jennifer Parker, an alcoholic mother, Loraine, and his father, George, is bossed around by his supervisor, Biff Tannen.
On October 26, 1985, Marty meets Dr. Emmett Brown in a mall’s parking lot. Doc shows him a time machine installed in a Delorean and powered by plutonium that he stole from Libyan terrorists. Doc also shows how to use the machine, keying in the date of November 5, 1995 as an example. It is the day the Doc came up with the idea of building a time machine. It is not long after the Libyan terrorist attacks them. Doc Brown is killed and Marty escapes using the Delorean but not without accidentally activating the time machine. Marty arrives in 1955 without the plutonium needed to run the time machine.
In that year, Marty meets the younger self of his father. Biff is already bossing him around by that time. Marty saves George from being hit by a car and he’s knocked unconscious. He wakes up to see the younger version of his mother who is totally enamored with him. Marty leaves her behind to track down Doc and ask for his help in returning to 1985. When he finds him, the scientist tells him that they can’t run the time machine without the plutonium. However, there’s an alternative way to get the machine running. They can harvest lightning and use it as fuel for the machine. Fortunately, according to the flyer that Marty has brought from the future, there is in fact a lightning that will be hitting the town’s courthouse the next Saturday night. Doc advises Marty to avoid doing anything that can alter the future. Marty then realizes that he has prevent his parents from meeting. Because of this, Doc prepares for their task in harvesting the lightning while Marty makes plans on introducing his mother and father to each other. As he does this, he accidentally makes trouble with Biff and his gang.
During the school dance, Marty plans to have his father “rescue” his mother from his naughtiness but his plan crumbles when Biff enters the scene and makes a move on Loraine. Fortunately, George arrives and saves Loraine from Biff. George and Loraine end up in the dance floor where they kiss and start to fall in love. Pleased with what has happened, Marty leaves the pair and goes to meet Doc.
When Marty goes to the clock tower, the lightning strikes just in time and they are able to power up the time machine. Marty returns to October 1985 and warns Doc about what will happen to him. Because of this, Doc dons on a bullet-proof vest and he takes Marty home before getting on board the time machine and sends himself to 2015.
The next morning, Marty wakes up just to find that his life has been changed completely. His father is now a successful author and his mother is quite happy with herself. Biff, on the other hand works under his father’s supervision. Marty meets up Jennifer just as Doc arrives on the time machine telling them that they must go with him because something wrong has happened with their children in the future.