The show will test the waters as a back-door pilot, an expanded two-hour episode of "Grey's" slated to air in May. It will center on neonatal surgeon Addison Shepherd (Walsh), a character who has enjoyed a strong following from fans since she was introduced at the end of the hot surgical drama's first season.
Diggs' casting in the "Gray" spinoff stems from a new talent holding deal he recently signed with ABC TV Studio, where "Grey's Anatomy" is based. He starred in two drama series for the studio, "Kevin Hill" for UPN and "Day Break" for ABC.
