As most of you probably of know, the first episode when Grey's Anatomy returns in 2010 will be part of a crossover with Private Practice. The first promo for the two-hour event aired after last night's (also two-hour) Private Practice, and we've posted it below:

[video url="http://www.tvfanatic.com/videos/greys-private-practice-2010-crossover/" title="Grey's-Private Practice 2010 Crossover"] [/video]

Mark and his daughter, who was introduced to us last week in "Holidaze," look to be at the center of the action, as does his former lover Addison. It should be a dramatic episode.

What are your predictions? Thoughts? Hopes?

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.