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Before there was <\/span>Grey\u2019s Anatomy, The Resident <\/span><\/i>and <\/span>New Amsterdam, <\/span><\/i>there was <\/span>ER. <\/span><\/i>The fast-paced, realistic and gripping medical drama<\/a> drew viewers in with its intense storylines and star-studded cast, and the day-to-day at Chicago\u2019s County General Hospital was hardly ever dull. Starring famous faces like George Clooney, Anthony Edwards, Julianna Margulies and Noah Wyle, these actors and actresses made the fictional emergency room what it was\u2014and some of the show\u2019s cast have dived right back into the chaos of working in a hospital yet again.\u00a0<\/span><\/p>\n At the start of 2025, viewers got to know Dr. Michael \u201cRobby\u201d Robinavitch in <\/span>The Pitt, <\/span><\/i>a new medical drama with a single season taking place over the course of a 15-hour shift at the <\/span>Pittsburgh Trauma Medical Center. While the show has been applauded for its medical accuracy and stunning cast performances, it also manages to touch on real issues faced by frontline workers throughout their day-to-day, such as lack of funding in medical institutions and PTSD. While it\u2019s ironic that this is Noah Wyle\u2019s second medical drama, he isn\u2019t the only cast member in <\/span>The Pitt <\/span><\/i>who appeared in <\/span>ER. <\/span><\/i>As a matter of fact, Katherine LaNasa, Shawn Hatosy, Michael Hyatt and Tracy Vilar have acted in both series, leaving many to question: Is <\/span>The Pitt <\/span><\/i>a spin-off of <\/span>ER? <\/span><\/i>Not quite. Here, we break down the differences, as well as dive into the complicated legal battle involving the two series.\u00a0<\/span><\/p>\n