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Things have barely settled from the excitement and resolve of the original Back to the Future, when in pops that crazy inventor Dr. Emmett Brown (Christopher Lloyd) with news that in order to prevent a series of events that could ruin the McFly name for posterity, Marty McFly (Michael J. Fox ) and his girlfriend are whisked into the future to the year 2015, where Marty must tangle with a teen rogue named Griff, who's obviously the descendant of Biff, the first Future film's bully. Marty foils Griff and his group when he jumps on an air-foil skateboard that flies him through town at rakish speeds with the loser bullies beaten again. Marty gets a money-making brainstorm before hopping in the time-traveling DeLorean, and he purchases a sports almanac. The end of Back to the Future, Part 2 introduces its sequel as the zany professor has already time-dashed away to the Wild West of the late 1800s and invites Marty into a new adventure.