Guest Stars Kelly McCreary as Dr. Margaret "Maggie" Pierce Jason George as Dr. Ben Warren Kate Burton as Dr. Ellis Grey Geena Davis as Dr. Nicole Herman Sally Pressman as Young Ellis Grey Megan Gallagher as Mrs. Oldroyd Libe Barer as Monica McKeever Christopher Redman as Chris Matthew Van Oss as David Oldroyd Co Starring Cynthia Youngblood as ER Nurse Curtis Walker as Medivac Guy Aria Lyric Leabu as Young Meredith Dyana Liu as Nurse Danny Jacobs as Doctor Ian Chen as Luca Peterson Emma Shannon as Lily Michelle Noh as Sharon Peterson Courtney Cunningham as Woman