House House

With House's Thirteen MIA while Olivia Wilde shoots back-to-back films (she's expected to return to Princeton-Plainsboro before season's end), House has tapped Joan of Arcadia's Amber Tamblyn to fill the void as med student Martha M. Masters. "Considering how horrific House is to doctors, just imagine him being your first mentor," says exec producer Katie Jacobs. "Her first challenge is: Can she stay on House's team?"

It's Cuddy who "insists House hire a woman, because she feels there's way too much testosterone on the team," Lisa Edelstein says. "Cuddy picks Masters and sort of shoves her on House."

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