This week's episode of Grey's Anatomy marks the debut of Dr. Teddy Altman (Kim Raver), as the new cardiothoracic surgeon at Seattle Grace-Mercy West. But it's her past relationship with Owen, a fellow Iraq war vet, that has Cristina questioning her from the start.

Meanwhile, Izzie returns to Seattle Grace with her high school mentor (Joel Grey) seeking treatment for his dementia, and the stress of Richard's responsibilities take their toll.

What do you think will happen this week? Are you excited about another new addition to the Grey's Anatomy cast? Click to enlarge some pics from the episode and comment ...

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