Seinfeld makes a detour to '30 Rock'

Today's column previews Jerry Seinfeld's very special guest appearance on "30 Rock" tonight:

"What's happened to this network?" an incredulous Jerry Seinfeld asks NBC executive Jack Donaghy (Alec Baldwin) in tonight's "30 Rock" season premiere.

What's happened? That's an easy one: Jerry left. He left to count his millions and make brilliant AmEx commercials and cut off his mullet, and NBC slowly but surely went into the toilet, much like Kristin Davis' toothbrush in that "Seinfeld" episode where she played his girlfriend.

And now he's back, trying to help the network out -- and plug his movie -- by guest-starring on "30 Rock," the reigning Emmy winner for best comedy and arguably the funniest show NBC's aired since "Seinfeld" ended.

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