Marty McFly is blasted to 1955 in the time machine created by Doc Brown and finds himself in a time-shattering situation that jeopardizes his future. Browbeaten by his principal at school, Marty must also endure the acrimonious relationship between his nerdy father and his lovely mother, who in turn suffer the bullying of middle-aged jerk Biff, Marty';;s dad';;s supervisor. The one balm in Marty';;s life is his friendship with eccentric scientist Doc, who at present is working on a time machine. Accidentally zapped back into the 1950s, Marty inadvertently interferes with the budding romance of his now-teenaged parents.  .