We're running out of time.
This week on "Grey's Anatomy," Derek's sister comes looking for help from her big brother. Check out the sneak peek for the crossover event with "Private Practice" below.
Read about Summer Glau to Grey's Anatomy. Join us on Twitter @soapoperafan and Facebook. Come tweet and Facebook with us about "Grey's Anatomy," all the other soap operas, "Glee" and "Vampire Diaries!"
- Candace Young
