<P> Maggie is first introduced in the penultimate episode of the tenth season . Cristina Yang interviews various different candidates to replace her as the head of her department in Cardiothoracic surgery . Maggie , having finished high school and medical school early , becomes head of her department at 31 years old . It is revealed in the season 10 finale `` Fear ( of the Unknown ) '' that Maggie 's biological mother was Ellis Grey . Richard Webber is shocked by this , knowing he is her biological father . Throughout the eleventh season , Webber struggles to deal with the revelation and keeps it from Maggie . Maggie explains that 2 years prior , she looked for her birth mom and needed to go to the court for the records . She found out that she was dead , but got her name , and discovered that she was an amazing surgeon that worked at the Seattle Grace Hospital . She stated that that 's not why she took the job , but it 's `` a little bit '' why she took the interview . </P>
<P> Maggie is first introduced in the penultimate episode of the tenth season . Cristina Yang interviews various different candidates to replace her as the head of her department in Cardiothoracic surgery . Maggie , having finished high school and medical school early , becomes head of her department at 31 years old . It is revealed in the season 10 finale `` Fear ( of the Unknown ) '' that Maggie 's biological mother was Ellis Grey . Richard Webber is shocked by this , knowing he is her biological father . Throughout the eleventh season , Webber struggles to deal with the revelation and keeps it from Maggie . Maggie explains that 2 years prior , she looked for her birth mom and needed to go to the court for the records . She found out that she was dead , but got her name , and discovered that she was an amazing surgeon that worked at the Seattle Grace Hospital . She stated that that 's not why she took the job , but it 's `` a little bit '' why she took the interview . </P>
when does maggie come in grey 's anatomy
when does maggie come in grey 's anatomy
the penultimate episode of the tenth season
the penultimate episode of the tenth season