It's not an exaggeration to say that "ER" is one of the most revered television shows of all time. Considered the gold standard of TV medical dramas, "ER" most certainly paved the way for contemporary ...

It's hard to believe, but it's been over 30 years since ER first debuted. And with 331 episodes during the show's run from 1994—2009, there have been A LOT of cast members over the years.