There's a fantastic unproduced Mad Men spec script that was written by Star Trek: The Next Generation, Deep Space Nine and Babylon 5 screenwriter Marc Scott Zicree that I would love to see turned into an actual episode!
The Mad Men spec script imagines a fantastic encounter between Twilight Zone creator Rod Serling and Mad Men's advertising guru Don Draper. This encounter changes each man for the better.
This is just a spec script and it may never get produced. But, I love the idea behind it and hope that it actually makes it into a episode of Mad men. You can read the full script here.
Here are a couple great little quotes from the episode:
I love it!!