'Bates Motel' season 5 spoilers news 2016: 'Grey's Anatomy' alumna, 'House of Cards' actress join cast for recurring roles; Marion Crane to have female lover?

Two new female characters will be joining the stellar cast lineup for A&E's acclaimed thriller drama "Bates Motel" season 5.

"Grey's Anatomy" alumna Brooke Smith is the latest addition to the series' upcoming farewell season, where she will play the role of Sheriff Dana Green. Known as the new face of law in White Pine Bay, she will replace Alex Romero (Nestor Carbonell), who has been incarcerated in the previous season. As a law enforcer, Smith's Dana exudes a small-town vibe, which completely contradicts her observant personality.

After ending her stint in the fifth season of long-running medical drama "Grey's Anatomy's," Smith has appeared on several popular programs including "Law & Order: SVU," "Ray Donovan" and "Nashville."

Just a day before Smith's character was announced, "House of Cards" actress Isabelle McNally landed a recurring role in the series as Norma Bates' (Vera Farmiga) doppelganger. McNally is set to portray the recurring role of Madeleine Loomis, a charming and attractive woman who bears a striking resemblance to Norma during her younger years.

Although it's still not clear how Madeleine figures into the fifth season, her last name suggests that she will have a connection to another newcomer Marion Crane. In the 1960s "Psycho" film where the series is based on, Marion's boyfriend was named Sam Loomis. Casting is currently underway for the role of Sam.

There are speculations that Madeleine is Sam's wife and Marion becomes the other woman. However, Zap2it points out that it could also be possible for Madeleine to be Marion's lover. Norman was attracted to Marion in "Psycho," but it is also probable for him to fall in love with his mother's doppelganger Madeleine and kill her instead.

Speaking with TV Line, executive producer Carlton Cuse previously hinted that they will make sure that the series won't just be a "Psycho" remake. "We wanted the final season to allow us to do our [spin] of the 'Psycho' lore. We will be colliding with certain events in the narrative of the film, but it would be boring to just recreate 'Psycho.'"

The fifth and final season of "Bates Motel" premieres sometime next year on A & E.