I saw a 1963 episode of The Twilight Zone titled "The Parallel" in which an astronaut, played by Steve Forrest, arrives in a world much like his own, except for a few small differences. Needless to say, he arrived in a parallel universe and it reminded me so much of the basic theme of Fringe. The thing I loved about The Twighlight Zone (and radio theater for that matter) is they build-up the story in the viewers/listeners mind which, in my opinion, is much more effective than showing some gimmicky CG visuals like they so often do today. I guess that's why I liked about the X-Files...by the time you saw something you were ready to jump-out-of-your-seat since they build-up the story in the viewers mind. Shows like CSI are losing their effectiveness because the graphics are so prevalent they have little impact on the audience.