Marty McFly was a young friend of Emmett Brown, a professor who has been trying to make a time machine for thirty long years. While the car is ready, the terrorists kill Emmett. Marty is saved by a car, getting into the past, and as luck would have it, it prevents her parents from meeting. In order for a guy to go back to reality, he needs plutonium. No less vital task is to reduce their own parents, otherwise the appearance of Marty will be under threat.