George Clooney, Elliott Gould, Sam Anderson, Conchata Ferrell, Jason Alexander, and Corrine Bohrer appear in episodes of E/R as well as Friends years later.
Based upon the play "E/R: Emergency Room" by Ronald Berman, Zaid Farid, Richard Fire, Carolyn-Purdy Gordon, Stuart Gordon, Gary Houston, Tom Towles and Bruce A. Young produced by the Organic Theater Company of Chicago, premiering Feb. 1982.
George Clooney's early role as Mark Kolmar occurred a decade before he shot to fame as Dr Ross in the hugely successful medical drama of (almost) the same name, ER (1994).