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"Grey's Anatomy" Is Officially 15 Years Old — Here Are 25 Side-By-Sides Of The Cast Then Vs. Now

"This is your starting line. This is your arena. How well you play...that's up to you."

1. Ellen Pompeo as Meredith Grey

2. Chandra Wilson as Miranda Bailey

3. James Pickens Jr. as Richard Webber

4. Justin Chambers as Alex Karev

5. Patrick Dempsey as Derek Shepherd

6. Sandra Oh as Cristina Yang

7. Katherine Heigl as Izzie Stevens

8. T.R. Knight as George O'Malley

9. Isaiah Washington as Preston Burke

10. Kate Walsh as Addison Montgomery

11. Kate Burton as Ellis Grey

12. Sara Ramirez as Callie Torres

13. Eric Dane as Mark Sloan

14. Jeffrey Dean Morgan as Denny Duquette

15. Chyler Leigh as Lexie Grey

16. Kevin McKidd as Owen Hunt

17. Jessica Capshaw as Arizona Robbins

18. Jesse Williams as Jackson Avery

19. Sarah Drew as April Kepner

20. Kim Raver as Teddy Altman

21. Jason George as Ben Warren

22. Caterina Scorsone as Amelia Shepherd

23. Camilla Luddington as Jo Wilson

24. Kelly McCreary as Maggie Pierce

25. And finally, BokHee An as Bokhee