Susan Sarandon
(© Tristan Fuge)
Susan Sarandon
(© Tristan Fuge)
Susan Sarandon, George Clooney, Noah Wyle, Eriq La Salle, and Julianna Margulies will all appear in the Thursday March 12 episode of NBC's ER, according to TVGuide.com.

Sarandon, the only one of the quintet not to have been a series regular, is currently starring on Broadway in Exit the King. Margulies, who played nurse Carol Hathaway for six years, starred on Broadway in Festen.

The Emmy-Award winning series, about life in a hospital emergency room, is currently finishing up its final season, having debuted on NBC in 1994. Other veteran cast members are expected to appear in its remaining episodes.