The final installment of the Back to the Future trilogy finds Marty digging the trusty DeLorean out of a mineshaft and looking for Doc in the Wild West of 1885. But when their time machine breaks down, the travelers are stranded in a land of spurs. More problems arise when Doc falls for pretty schoolteacher Clara Clayton, and Marty tangles with Buford Tannen.

Marty and Doc are at it again in this wacky sequel to the 1985 blockbuster as the time-traveling duo head to 2015 to nip some McFly family woes in the bud. But things go awry thanks to bully Biff Tannen and a pesky sports almanac. In a last-ditch attempt to set things straight, Marty finds himself bound for 1955 and face to face with his teenage parents -- again.

描述一群青少年学生参加美国太空总署主办的太空夏令营，亲身体验太空登月的操作环境。不料在一次意外中，他们乘坐的太空舱竟然真地发射升空，几个年轻人登时六神无主，幸好有一个机器人留在舱中协助他们化险为夷。在众多的太空科幻片中，哈瑞．温勒导演本片较著重太空知识的传递而非眩目迷人的特效。外景在NASA 实地拍摄，有些地方颇令人大开眼界。凯特．卡普肖饰演女教官、利．汤普森、凯利．普雷斯顿饰演太空历险的学生，但最讨人喜欢的还是那个造型和表演都相当有趣的机器人。

Eighties teenager Marty McFly is accidentally sent back in time to 1955, inadvertently disrupting his parents' first meeting and attracting his mother's romantic interest. Marty must repair the damage to history by rekindling his parents' romance and - with the help of his eccentric inventor friend Doc Brown - return to 1985.