Back to the Future is a 1985 American science fiction comedy adventure film directed by Robert Zemeckis, written by Zemeckis and Bob Gale, produced by Gale and Neil Canton, and stars Michael J. Fox, Christopher Lloyd, Lea Thompson, Crispin Glover and Thomas F. Wilson. Steven Spielberg, Kathleen Kennedy, and Frank Marshall served as executive producers. In the film, teenager Marty McFly (Fox) is sent back in time to 1955, where meets his future parents in high school and accidentally becomes his mother's romantic interest. Marty must repair the damage to history by causing his parents-to-be to fall in love, and with the help of eccentric scientist Dr. Emmett "Doc" Brown (Lloyd), he must find a way to return to 1985. Wikipedia
George McFly: Lorraine, my density has bought me to you. Lorraine Baines: What? George McFly: Oh, what I meant to say was... Lorraine Baines: Wait a minute, don't I know you from somewhere? George McFly: Yes. Yes. I'm George, George McFly. I'm your density. I mean... your destiny.