The CW has cast its final series regular for the Supernatural spinoff, while also renaming the planned project.

Now known as Supernatural: Bloodlines, the drama will still be centered in Chicago and based around a pair of monster families that run the underbelly of the Windy City.

And Melissa Roxburgh will play a major role.

The actress (who actually appeared on the Supernatural Season 7 episode "Tim After Time") will portray Violet Durant, a member of a strong werewolf pack who keeps her true nature a secret because of her forbidden love for family rival David (played Nathaniel Bozulic), a shapeshifter.

Other Supernatural: Bloodlines regulars will include:

• Danielle Savre as shapeshifter Margo Hayden.
• Sean Faris as a werewolf Julian Durant.
• Lucien Laviscount as police academy trainee/newly-minted Hunter Ennis Roth.
• Stephen Martines as a veteran Chicago PD Detective Freddie Costa.

These characters will appear on an upcoming Supernatural Season 9 episode that will serve as the spinoff's backdoor pilot.

As for other spinoffs also in the works...

Upcoming Spinoffs: Which Has You Most Excited?

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Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.