John Slattery to Guest Star on 30 Rock

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30 Rock is dipping its toes back into the talented Mad Men water.

Following last season's successful stint by Jon Hamm on the sitcom, fellow cast member John Slattery has signed on to appear alongside Liz Lemon and company later this year.

The man who plays Roger Sterling will take on the role of a candidate for congress on this season's seventh episode, Entertainment Weekly reports. Slattery has actually portrayed a New York politician in the past.

He recurred in that capacity years ago on Sex and the City.

Lemon Law
John Slattery Picture

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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30 Rock Quotes

Fine, I will try the other location. But frankly, LaDonica, you have not been real helpful.

Kenneth

I believe that when you have a problem, you talk it over with your priest, or your tailor, or the mute elevator porter at your men's club. Then you take that problem and you crush it with your mind vice. But for lesser beings, like curly haired men and people who need glasses, therapy can help.

Jack