<Tr> <Th> Relatives </Th> <Td> Little Susie (niece) </Td> </Tr> <P> Dr. Susan Lewis, played by Sherry Stringfield, is a fictional doctor on the television show ER . </P> <P> Susan is one of ER's original characters, first seen in Season 1 as an eager resident . She left County General Hospital and the series in Season 3, but returned five seasons later as an attending physician in Season 8 . Susan Lewis eventually checked out of the ER for good in 2005 at the beginning of Season 12, having been passed over for tenure in favor of John Carter by Kerry Weaver . She was offered a tenured position at a hospital in Iowa . She returned in the final episode . Susan is left handed . </P> <P> In Season 1, Susan is a second year resident . She is shown to be an eager and competent young doctor working in the emergency department of County General Hospital . She is good friends with Nurse Carol Hathaway, Dr. Doug Ross and especially Dr. Mark Greene, who is her best friend . </P>

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