Things only got worse when Joi, at the end of her tether, asked Ross to help end her son's suffering.

Ross got into serious trouble with Weaver and his good friend Mark Greene (Anthony Edwards) when his actions were discovered. To help a terminally ill boy diagnosed with ALD and his exhausted mother Joi, Ross went against protocol and gave them some pain medication that endangered an ongoing study. In ER season 5, Ross' rule-breaking for the benefit of his patients proved to be too much for his County General co-workers. Related: No, Friends Did NOT Have An ER Crossover With George Clooney And yet, his relationship with nurse Carol Hathaway (Julianna Margulies) could always be counted on to temper his more destructive decisions. As a result, Ross frequently found himself in hot water with his superiors and fellow doctors, most notably Kerry Weaver (Laura Innes). He cared about his patients deeply and would do anything to help them - including going against the rules. As the emergency room's primary pediatrician, Ross was known for his rebellious tendencies and, for a time, womanizing attitude. A good number of major stars walked through those bustling halls during ER's run, with Clooney perhaps being the biggest.Ĭlooney was one of ER's six original cast members. Running from 1994 to 2009, the series focused on the doctors working in the emergency room of Chicago's County General Hospital. Before Grey's Anatomy became America's top medical series, ER reigned on NBC for 15 seasons.

George Clooney's Doug Ross was the resident heartthrob of hit medical drama ER before departing in season 5 let's break down why he left and his cameo in season 15.

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