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According to TV Guide actress Debbie Allen is currently directing "an out-of-the-box episode of Grey's Anatomy that finds the Seattle Grace docs facing off against other hospitals on the baseball field".
Also, actor Scott Foley who plays Henry on the show tweeted this today:
@scottkfoley: Big Grey's location day. Glad I'm not in charge of the trailers!
We love seeing those docs out of their scrubs, non?