In the second installment of the Back To The Future Trilogy, Marty winds up with his girfriend Jennifer travelling to the future with Doc to right their kid's troubles. In the process, Biff, Marty's nemesis... ends up stealing the time machine without anybody knowing travelling back in time to a very important year: 1955. With very little clue, the trio step back into the car, back to present time... unaware that their present time had been altered by Biff from the future. In 1985, the city is now amock with crime. Marty awakes after being beaten out cold in front of his mother... who is now married to Biff. His father is gone, and Biff is now the Kingpin of the city. He runs everything now.

Fast forward to the past, Marty and Doc find out Biff in 1955 has acquired the sports almanac for every year from 1950 to 2000, where he plans to win every sports bet for the next 50 years. It's up to Marty to restore the present to what it was supposed to be... and steal the almanac back from Biff...