Long before NBC's ER became part of the network's "Must See TV", CBS had an E/R of its own starring Elliott Gould. The E/R on CBS, however, was a sitcom, not a drama.
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Other than being set in an ER, the CBS E/R had little in common with the future ER on NBC other than the name... Oh, and George Clooney:
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CBS' E/R would only last one season, but it did air frequently on the USA Network, back when they routinely showed short-lived sitcoms.