Posted 28 minutes agoSubscribe to Screen Time NewsletterCaret DownSorry, But Only The Biggest "ER" Fans Will Be Able To Identify These Characters Based On Just A PhotoThis series has more characters than I can count.by Michele BirdBuzzFeed ContributorFacebookPinterestLinkHot Topic🔥 Full coverage and conversation on ER With 15 seasons and 331 episodes of ER, there have been A LOT of cast members and guest stars during the show's run from 1994-2009.