There's a handful of Back to the Future theories floating around the internet, and one, which posits that George McFly eventually knew «Calvin» (a.k.a Marty) was his real son, changes everything fans have always thought. The 1985 sci-fi comedy follows Marty's (Michael J. Fox) journey into the past. Of course, the world now knows how seemingly harmless time travel can have damning consequences if done incorrectly. Marty (who famously gains the alias of "Calvin Klein") travels back to 1955, meeting teenage versions of his mother and father. Even so, despite pretending to be someone else during his Back to the Future time travel journey, Marty's father, George, may very well discover that Calvin from his youth was actually his son later in life.
The story of Michael J. Fox's Marty in Back to the Future opens with him as a normal California teen. The year is 1985 and he's concerned with typical high school-aged things, like his girlfriend, his musical aspirations, and becoming his own person that's separate and different from his parents. Then, «Doc» Brown (Christopher Lloyd) shows up with a DeLorean that can defy the rules of time, and the normalcy of Marty's life goes out the window. He's transported back to the 1955 version of his town and many of its citizens, including his own parents.
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There's a Back to the Future fan theory on Reddit that posits the idea that "by 1985 George McFly was able to figure out Marty was his own son from the future." The post's author points out that Marty does a handful of things during his Back to the Future time-traveling escapade that would turn out to be eerily accurate or sort of «before their time» (such as predicting the town's
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