A minor-league baseball player must spend $30 million in 30 days in order to inherit $300 million. However, he's not allowed to own any assets, destroy the money, gift it, give it to charity, or tell anyone about the deal.
Marty McFly, a 17-year-old high school student, is accidentally sent 30 years into the past in a time-traveling DeLorean invented by his close friend, the maverick scientist Doc Brown.