Cassidy, Vandervoort in CW dramas

Actress Katie Cassidy arrives at the premiere of her new comedy film 'Click' in Los Angeles, in this file photo from June 14, 2006. Canadian actress Laura Vandervoort has landed the coveted role of Kara/Supergirl on the CW's ''Smallville,'' and Cassidy has been added to ''Smallville's'' companion series, ''Supernatural.''

LOS ANGELES (Hollywood Reporter) - Canadian actress Laura Vandervoort has landed the coveted role of Kara/Supergirl on the CW's "Smallville," and Katie Cassidy has been added to "Smallville's" companion series, "Supernatural."

Kara/Supergirl will have a major presence on "Smallville" in the coming season. The character will be introduced in the show's seventh-season premiere.

Cassidy's character, Ruby, will make her first appearance on "Supernatural's" third-season premiere. Ruby is a fellow demon hunter who Sam and Dean Winchester (Jared Padalecki, Jensen Ackles) meet when they begin searching for the masses of demons who escaped from hell in the Season 2 finale.

Cassidy, daughter of '70s pop star David Cassidy, has appeared in such features as "Click," "When a Stranger Calls" and "Black Christmas." She also has been signed to play Lucy Ewing in the upcoming big-screen adaptation of the TV series "Dallas." On TV, she had a recurring role on "7th Heaven."

Reuters/Hollywood Reporter