Marty McFly, Emmett Brown, and Jennifer Parker go to 2015 to improve the future. While there, two tasks need to be accomplished, including surviving a hoverboard chase, and escorting Jennifer out of the McFly residence without being seen by any of the McFly family. Marty and Doc head back to 1955, where Marty must complete a puzzle while his younger self is playing on stage at the Enchantment Under the Sea dance, before time runs out, to ensure that Biff's gang doesn't prevent Marty's original return to 1985.