Meredith, Derek, Cristina, Izzie and George are finally back tomorrow night, and to test your Grey's Anatomy knowledge and celebrate this occasion, the Grey's Anatomy Insider staff has collaborated with Parade Magazine on an exclusive, 50-question quiz!

Think you're the #1 fan who knows everything there is to know about Grey's Anatomy and its tremendous cast? Bring it on. Just click on the image below to take this brain-busting Grey's Anatomy Insider quiz, hosted by Parade.

Once you've finished taking the quiz, Parade also has some new interviews and photos of the Grey's Anatomy cast in honor of the show's return!

Come back and let us know how you did!

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