10/12/2012 05:07 am ET Updated Oct 12, 2012

'30 Rock': Bryan Cranston And Catherine O'Hara Ham It Up As Kenneth's Family (VIDEO)

Kenneth Purcell had his world turned upside down this week on "30 Rock," when his mother, played by Catherine O'Hara, dropped by for a visit. She brought along her friend Ronald McDonald, played by Bryan Cranston, which brought out a very rare thing -- mean Kenneth. Kenneth clearly hated this guy, which made it even harder when his mom dropped a bombshell on him.

She revealed that she and Ron had gotten married ... seven years ago. "Look, Ken. I’m just trying to replace your dad, Ron said. "Oh, dang it. That’s the wrong thing to say, isn’t it."

It was certainly a lot of fun watching Cranston flex those comedy muscles he honed to perfection on "Malcolm in the Middle" after so many years playing it dark and serious on "Breaking Bad."

Elsewhere, "TGS" found itself more successful than ever when Mitt Romney's new running mate happened to be a buffoon who looked exactly like Tracy Jordan. It was a clear spoof of the position Tina Fey was in when Sarah Palin came on to the scene.

The final season of "30 Rock" continues on NBC, Thursdays at 8 p.m. ET.

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