Drama Ensues on 'Grey's Anatomy' Season Finale

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Season seven of "Grey's Anatomy" draws to a dramatic close tonight, and although there aren't any crazed gunmen in sight, the staff of Seattle Grace are nonetheless in for some life-changing events.
As word spreads that Meredith (Ellen Pompeo) tampered with Derek's (Patrick Dempsey) Alzheimer's trial, Alex (Justin Chambers) gets a leg up in the race for chief resident.
Meanwhile, Cristina (Sandra Oh) finds herself in a compromising situation, forcing her to decide between her career and her relationship.
Special guest stars for finale include: Scott Foley, Rachael Taylor, and James Tupper.
Don't miss all the action as 'Grey's' airs tonight on ABC.