Of the many guest stars this season on 30 Rock, we had a clear favorite. But is Jon Hamm, who played Liz Lemon's bubble-dwelling boyfriend Dr. Drew, ever coming back?

Sadly, it looks like Hamm's hamming it up on 30 Rock is a thing of the past. He told E! at an NRDC environmental charity event that he doesn't see a return happening:

"I don't think so. I'm certainly not going to rule anything out because those decisions aren't up to me and I had a blast doing it. I have to get going on season three of Mad Men; we'll be starting that in a couple of weeks, so I'll be pretty taken up this summer."

The good news, of course, is that season three of Mad Men premieres August 16.

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