A Back to the Future Part II fan theory suggests that Doc Brown could've been up to something other than he originally ...

The second movie sees Marty and Doc travel to 2015 in an attempt to stop Marty's son, Marty McFly Jr., from committing a robbery that leads to a chain of events that destroys the McFly family.

In 1955, Marty McFly receives written word from his friend, Doctor Emmett Brown, as to where can be found the DeLorean time machine. However, an unfortunate discovery prompts Marty to go to his ...