This list will include current and future characters up until Season 20 of Grey's Anatomy and their first appearances.
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Joseph Morgan as Dr. Lucas Nash - (S1 EP1)
Dean Winters as Dr. Matthew 'Matt' Willis - (S1 EP1)
Jodie Whittaker as Lily Mina - (S1 EP1 [over phone], S3 EP25 [physically])
Aidan Turner as Dr. Liam McLaughlin - (S2 EP14)
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Grey's Anatomy (S1-8)
FanfictionSurgical interns and their supervisors embark on a medical journey where they become part of heart-wrenching stories and make life-changing decisions in order to become the finest doctors.