Change has come to Chicago’s County General. In this powerful, unforgettable, and series-changing season of ER, twenty-two of the most dramatic and compelling hours of television unfold with excitement, suspense, joy, and grief — all in a single heartbeat. ER’s latest hopefuls — Army Reservist Michael Gallant (Sharif Atkins) and brash Gregory Pratt (Mekhi Phifer) — arrive to face the challenges of life in Trauma One. Meanwhile, Chen (Ming-Na) defies demotion and Malucci (Erik Palladino) crosses the line once too often. And as Peter Benton finally weighs his career and family, a familiar face returns from the past (Sherry Stringfield’s Dr. Susan Lewis). As Dr. Greene fights his final battle — leaving a void in the ER’s heart — his former student, John Carter, must step into the breach to lead the group of healers. Also starring Laura Innes, Alex Kingston, Goran Visnjic, Maura Tierney, and more, this is a season not to be missed.