As a self-proclaimed movie buff, John has seen his fair share of time traveling movies. Some of the more memorable ones include Back to the Future, Looper, Bill and Ted’s Excellent Adventure and Harry Potter: Prisoner of Azkaban. Now the rules of time travel seem to differ movie to movie. Single timeline vs. multiple timelines, predetermination vs. free will…there’s a lot going on here. John needs Ryan, a man of science, to help sort through it all and determine which movie’s time travel rules make the most sense.