ER was a long-running procedural television series from Warner Bros. about the professional and personal lives of the County General Hospital staff in Chicago. It starred Linda Cardellini, George Clooney, Anthony Edwards, Troy Evans, Alex Kingston, Eriq La Salle, Julianna Margulies, Paul McCrane, Parminder Nagra, Mekhi Phifer, Lily Mariye, Gloria Reuben, Maura Tierney, Shane West, and Noah Wyle, etc.
Others who appeared on the show were Sam Anderson, Sharif Atkins, Angela Bassett, Michael Beach, Maria Bello, Jorja Fox, Erica Gimpel, Mariska Hargitay, David Lyons, William H. Macy, Michael Michele, Elizabeth Mitchell, Leland Orser, Busy Philipps, Glenn Plummer, CCH Pounder, Kyle Richards, Pamela Sinha, John Stamos, Cress Williams, Jim Childs, Robert Cicchini, Sally Field, Danielle Harris, Nina Henderson, Patrick Kilpatrick, Piper Laurie, John Leguizamo, Dick Miller, Emily Rose, Susan Sarandon, Michael B. Silver, Carrie Snodgress, etc.
Actor Jim Childs recalls taking a shortcut on the Warner lot as he headed back to the ER set after a lunch break. This was when he first met George Clooney, who was walking towards his trailer. Clooney had just been cast in the role of Batman in 1997's feature film Batman & Robin and was working both jobs.