Tina Fey on Mad Men star Jon Hamm's visit to 30 Rock next week:

"Jon will be playing Dr. Drew Baird, and he lives upstairs from Liz Lemon. He's her neighbor that she naturally becomes smitten with and desperately tries to make advances toward, even though it's clear from the beginning that he is wildly out of her league."

Check out the sneak peek of Jon Hamm on 30 Rock below ...

[video url="/videos/generalissimo-sneak-preview-1/" title="Generalissimo Sneak Preview #1"][/video]

In this second sneak preview of next Thursday's episode, "Generalissimo," a new development in Jack's relationship with Elisa occurs when her disapproving grandmother says he resembles a telenovela villain. Yes, that's the actual synopsis. Only on 30 Rock ...

[video url="/videos/generalissimo-sneak-preview-2/" title="Generalissimo Sneak Preview #2"][/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.