Grey's Anatomy Is Bringing Back Derek's Sister Amelia on a Recurring Basis -- But Why?

Grey's Anatomy Amelia ReturnsThere’s something about Amelia… that will necessitate an extended Grey’s Anatomy visit from Derek Shepherd’s youngest sister.

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Caterina Scorsone, who created the role of substance-abusing neurosurgeon Amelia for the Grey’s spin-off Private Practice, will return to ABC’s hospital drama in early May, TVGuide.com reports — but not just for a one-off encore, but to recur through to the end of the season.

No details are yet available on the storyline dictating the once-estranged Shepherds’ reunion.

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Scorsone has twice before brought Amelia to Grey’s — most recently in February 2012, when Derek’s counsel was sought in treating Cooper’s baby mama Erica.

Why do you think Amelia might be a keeper this go-round?