ER Guest Stars Quiz

How Well Do You Remember the Guest Stars of ER?

Over its 15 years on the air, ER has had some pretty memorable guest stars — including a Gilmore Girls alum who's clocking in for the show's final episode tonight. In lieu of a traditional brainteaser today, I thought I'd test your knowledge of which famous — and soon-to-be famous — stars appeared on the NBC medical drama over the past several years. Good luck!