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The enemy of my enemy is my friend! McDreamy (Patrick Dempsey) and Cristina (Sandra Oh) find they have common ground after all when they are both thrown out of Meredith's (Ellen Pompeo) bed by the newly arrived Melissa George. Derek and Cristina might not have Mer, but they're pretty funny together without her!

Also new in town? Mary McDonnell, who makes her first appearance in this episode as a heart surgeon with Asperger's syndrome, which makes her behave, like, well, Sheldon from The Big Bang Theory or Reid from Criminal Minds. See for yourself...

What do you think of McDonnell's performance? How do you feel about Meredith and this whole "death" business? Post your take in the comments!