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What "ER" 18-th episode about
Mark serves his final day in the ER overseeing the first day of Gregory Pratt, a cocky yet eager new intern. Through observing his patients, he decides to forego chemotherapy, and spend his remaining days in peace. He also meets with his ex-wife, tells Weaver to live a little and leaves, never to return. Meanwhile, Abby plans to move back into her apartment when her landlord lets her know that Brian's moved out.
Episode number: 18
Episode name: "Orion in the Sky"
Episode release date: 5 april 2002 at 03:00
Status: aired
Rating: 8.9