Popsugar Entertainment Nostalgia Friends Guest Stars 24 Friends Guest Stars You Might Have Forgotten About 23 September 2019 by Hedy Phillips View On One Page Photo 21 of 22 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 21 George Clooney and Noah Wyle as Dr. Michael Mitchell and Dr. Jeffrey Rosen The E.R. doctors guest star in season one as doctors yet again. Previous Next Start Slideshow NostalgiaFriendsTV