Without question, one of my favorite movie trilogies of all time is Back to the Future.  How can you not love Marty McFly, Doc Brown and that awesome DeLorean with the flux capacitor that requires 1.21 gigawatts of power to travel through time?  The flaming tire tracks?  The Huey Lewis soundtrack?  And of course, the lovably dense villain of the  story, Biff Tannen.

Hello?  McFly?

For all of its fun, though, the Back to the Future trilogy asks a genuinely intriguing question.  What would happen if you could change the past?

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