30 Rock Spoilers: Will Jon Hamm Return?

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.