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.

Add Yahoo as a preferred source to see more of our stories on Google. "I'd do that in a heartbeat," said Clooney in the Entertainment Tonight interview. He clarified that he hasn't spoken about ...

And here's Noah Wyle now: Related: 17 TV Shows That Aged So Well, They’re Actually Wayyyy More Popular Now Than They Were When They Originally Aired Related: After "Wicked: For Good" Dropped Its Final ...