THE PROSECUTION
Evidently unable to differentiate between ''friendship'' and ''psychological warfare,'' Izzie has become the mean girl of Grey's High, hijacking one of TV's most enjoyable shows. Put her in a prom dress and lock her in the bathroom until she calms down.

THE DEFENSE
How refreshing to focus on someone who comes out and says what she's feeling — even to her superiors — and sticks to her guns. If Izzie's upset, you know it. If she's not speaking to you, you're gone. But if she's on your side, she'll cling to your best interests with the tenacity of an angry panda and bake you muffins. Her uncensored emotions guide the actions of everyone around her, and her pain, loyalty, and love are the forces that drive the Grey's universe.

THE VERDICT
The Stevens brand of clumsy, oversize passion is never easy to deal with, but even in her ugliest moments, you gotta admit the girl keeps things interesting — and the exquisite acting of Katherine Heigl just makes adoration that much easier. (That awkward ''I believe'' speech would have killed lesser women.) Forget the crabby lady with the voice-over: It's Izzie's heart that keeps Anatomy beating.


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