Can You Guess These ER Guest Stars?
by Susan McDonald
NBC

The long-running TV series "ER" made stars out of George Clooney, Julianna Margulies, Noah Wyle and many more, but the regular cast members weren't the only famous faces to show up at County General. Do you remember when these actors stopped by for a guest appearance?

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About Zoo

Our goal at Zoo.com is to keep you entertained in this crazy life we all live.

We want you to look inward and explore new and interesting things about yourself. We want you to look outward and marvel at the world around you. We want you to laugh at past memories that helped shape the person you’ve become. We want to dream with you about all your future holds. Our hope is our quizzes and articles inspire you to do just that.

Life is a zoo! Embrace it on Zoo.com.