Exclusive: 30 Rock Casts Bryan Cranston and Catherine O'Hara

Over the course of 30 Rock's run, we've met most of TGS' extended family: Tracy's wife, Jack's brawling siblings and Donaghy matriarch Colleen, Liz's folks and stunted brother, Jenna's mom, even Lutz's look-alike mother. But the one (albeit murky) bloodline that has eluded fans so far has been the kin of hillbilly page-turned-janitor Kenneth Parcell (Jack McBrayer). But no more! 



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