Grey's Anatomy

On Thursday, Grey's Anatomy will celebrate a momentous milestone as the show airs its 200th episode. With that in mind, TVGuide.com decided to look back to the very beginning to find out how the cast of the ABC medical drama joined the show.

Photo Gallery: Grey's Anatomy cast shares their audition stories!

Who almost didn't make the cut? Who wanted a different role? Who played chicken with the casting directors? Ellen Pompeo, Patrick Dempsey, Sandra Oh and the rest of the cast share their audition stories here. Check them out!

Grey's Anatomy airs Thursdays at 9/8c on ABC.