It's the reunion you've been waiting for.

So teases the video below, as ER airs a major television event next Thursday.

Past favorites such as Eriq LaSalle, Julianna Marguiles and George Clooney all return for a final appearance on the show that made them famous. Even Oscar-winner Susan Sarandon stops by.

Watch the promo following this article's jump and remember to tune in to ER on March 12...

[video url="/videos/an-er-reunion/" title="An ER Reunion"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.