"Back to the Future Part II" is a science fiction film released in 1989, directed by Robert Zemeckis. It is the sequel to the original film, continuing the adventures of Marty McFly and Doc Brown. In this installment, Marty travels to the year 2015 to prevent his future son from getting into trouble. While in the future, Marty encounters various futuristic technologies, including hoverboards and self-lacing shoes. However, his actions inadvertently alter the timeline, leading him and Doc to return to 1955 to fix the changes and restore the original timeline.