Great Scott! Marty McFly has just returned from the adventure of a lifetime to a new, better Hill Valley?-everything's looking up for him! That is, until Marty and his friend Doc Brown's time machine attracts the attention of the Decepticons! With one small mistake, Marty finds himself once again thrust into adventure to stop the Decepticon plot in the past, present, and future... all with the help of a new time machine... the Autobot, Gigawatt!