Claim: A Nightmare on Elm Street stars at least one actress.

Katherine Evelyn Anita `` Katie '' Cassidy -LRB- born November 25 , 1986 -RRB- is an American actress . After initially appearing in minor television roles , she made her film debut in When a Stranger Calls -LRB- 2006 -RRB- . During the same year , she also had her first starring role as Kelli Presley in Black Christmas -LRB- 2006 -RRB- . In 2007 , Cassidy gained attention for her role as Ruby on the supernatural-horror television series Supernatural , during its third season . She later had a supporting role in Taken . In 2009 , Cassidy became a cast member of the series Harper 's Island and Melrose Place , both of which lasted for only one season . During 2010 , she had a supporting role in A Nightmare on Elm Street and a recurring role during the fourth season of Gossip Girl .   Cassidy had her breakthrough in 2012 , after being cast as Laurel Lance / Black Canary , one of the main protagonists on the television series Arrow , which spawned an entire franchise known as the Arrowverse . Cassidy reprises her role in The Flash , Legends of Tomorrow and voiced the character in the animated web series Vixen . Following her character 's death , Cassidy began playing Laurel Lance / Black Siren , an antagonistic version of her character from a parallel universe , starting in The Flash and continuing on to Arrow . Because of her roles in numerous horror films -LRB- most of which are remakes of classics of the genre -RRB- which include her feature film debut When a Stranger Calls -LRB- 2006 -RRB- , The Lost -LRB- 2006 -RRB- , Black Christmas -LRB- 2006 -RRB- , and A Nightmare on Elm Street -LRB- 2010 -RRB- , she has been called a modern-day scream queen .