
Marty McSkywalker (Michael J. Fox) is a 17-year-old commanding officer in the Rebellion. He is friends with the eccentric scientist and space pilot Han "Doc" Solo (Christopher Lloyd). While at the rebel base on Hoth, Doc begins aggressively pursuing Princess Leia (Carrie Fisher), a high ranking official within the Rebellion. When the base is attacked by the Empire, Marty, Doc and Leia abandon the base in Doc's spaceship, the Millennium Falcon.
Doc continues his pursuit of Leia while aboard the ship, where she decides to make him jealous by making out with Marty right in front of him. At the time, Marty flaunts this to Doc, but during a later encounter with Darth Vader, Marty learns that Leia is actually his sister. Gross!
Upon hearing this startling news, Doc forgives Marty for totally mackin' on his woman and suggests he use the Millennium Falcon, which is equipped with a time machine, to go back in time and stop him from ever tongue-jousting with his sister. All they need to do is go 88 miles per hour, which is really easy to do in a spaceship.
The effects of Marty's time traveling have significant consequences, though. Years after the Rebellion is victorious against the Empire, time seems to jump back 50 or so years to when Darth Vader was nothing more than an innocent child. And really, nobody needed to see that.
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