Old Times at ER

It is indeed Old Times for ER (March 13, 2009, Season 15 Episode 13 "Old Times")
We got to see previous characters blended into this season's story perfectly, and then gone again.
10.7 million viewers tuned in, best rating in several years, despite NBC's quiet non-promotion

I will miss ER dearly, after 15 years.

• Noah Wyle (Dr. John Carter)
• George Clooney (Dr. Doug Ross)
• Julianna Margulies (Carol Hathaway)
• Eriq La Salle (Dr. Peter Benton)