As Grey's Anatomy sneak previews go, this one is pretty big. We learn:

• That Derek wants to have McBabies (!) with Meredith
• That Izzie has served Alex with divorce papers (!)
• That Meredith and Alex's friendship is awesome
• That Alex's brother arrives unannounced

All in 90 seconds! The sneak peek below, from Thursday's "Sympathy for the Parents," begins with Meredith in bed and takes place largely with Alex "being a girl" in the shower.

Intrigued yet? Watch below and comment afterward ...

[video url="http://www.tvfanatic.com/videos/sympathy-for-the-parents-sneak-preview-1/" title="Sympathy For the Parents Sneak Preview #1"] [/video]

Follow the jump for three more clips from this week's all-new Grey's Anatomy, two of which feature Alex's brother Aaron, who's upset to learn about the developments in Alex's life in the seven years since he's been gone, and one previewing an intense surgical situation ...

[video url="http://www.tvfanatic.com/videos/sympathy-for-the-parents-sneak-preview-2/" title="Sympathy For the Parents Sneak Preview #2"] [/video]

[video url="http://www.tvfanatic.com/videos/sympathy-for-the-parents-sneak-preview-3/" title="Sympathy For the Parents Sneak Preview #3"] [/video]

[video url="http://www.tvfanatic.com/videos/sympathy-for-the-parents-sneak-preview-4/" title="Sympathy For the Parents Sneak Preview #4"] [/video]

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