It's always rush hour at the ER. Each day - each moment - brings new challenges triumphs and losses. No one ever expected those losses would include one of County General's talented med students.The pell-mell ER rotation continues with the 22-episode Season Six of the award-winning series. New stories unfold as young doctors (portrayed by Goran Visnjic Michael Michele Ming-Na and more) face the day-in day-out rigours of life-and-death decisions as a veteran physician (guest star Alan Alda) faces a bittersweet conclusion to his career. Old stories resolve: Boulet finds love and family; Hathaway gives birth to twins and makes a decision fans have long awaited. And tragedy strikes - swiftly irrevocably and for survivor Dr. John Carter perhaps irreparably.