Cast of ER Cast of ER "ER" is an American drama series that aired on NBC from September 19, 1994 until April 2, 2009. The series featured a large ensemble cast that changed dramatically over its long run. The main cast was augmented by a wealth of recurring characters and award-winning guest stars. The original starring cast consisted of Anthony Edwards as Dr. Mark Greene, George Clooney as Dr. Douglas "Doug" Ross, Sherry Stringfield as Dr. Susan Lewis, Noah Wyle as medical student (later Dr.) John Carter, and Eriq La Salle as Dr. Peter Benton. Julianna Margulies guest starred in the pilot as
Acclaim Entertainment 3", "The Last Job" and "Interview with a Made Man". When Acclaim's agreement with GMAC Commercial Finance, their primarmy lender, expired on August 20, 2004, the company closed all of its facilities on August 27, of which the Austin and New York studios saw all employees let go. Prior to the closures, as of March 31, 2004, Acclaim employed 585 staff worldwide. Acclaim announced on August 30 that they were to go bankrupt, and filed for Chapter 7 bankruptcy with the United States bankruptcy court in Central Islip, New York on September 1. A September 2005 complaint filed with the