Back To The Future is a beloved classic known for its quirky originality and fun characters, but a dark theory suggests that time-travel genius Doc Brown actually killed protagonist Marty McFly. The relationship between the two characters is, in many ways, the core of the film. It is somehow never questioned as to how Marty and Doc became friends, and the absurd and strange friendship between a mad scientist and a high schooler is only appreciated for its odd sincerity. Thus, this dark theory with a murderous undertone seems hard to swallow.
Time travel is obviously a huge part of Back To The Future, and films involving time travel are innately complex. There is the possibility of crossing time-streams, creating paradoxes and ruinous butterfly effects. Thus, with so much to be considered, time travel films open up a plethora of fan discussions and theories. This particular theory concerns the first film, the ending of which sees Marty return to 1985 and witness a «new» Marty enter the Delorean and disappear, which is cause to wonder whether Doc had to do something dark in order to prevent a time disaster.
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As detailed by a Reddit user, this theory suggests that Doc killed this second Marty to prevent the two from accidentally overlapping and meeting in 1955. He did this by rigging the Delorean to burn upon this second use, which would eliminate the possibility of there being two Marty's and two Delorean's in the same place at the same time, which would cause a paradox. It is also theorized that, if not rigging the Delorean to essentially self-destruct, then Doc could have programmed the time machine to go to a different time. This is still fairly severe as it would
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