General Hospital Casts Knots Landing Star Donna Mills

General Hospital has cast Knots Landing star Donna Mills in a mysterious role, Entertainment Weekly reports.

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The actress, who's best known for playing Abby Ewing on the CBS soap, was the only choice for the important new character, according to EW. While no details on her role have been released, you won't have to wait too long to find out: Mills is slated to make her debut in late February.

Any guesses for who she might be playing?