Question: On which television T.V. show does actress Katie Cassidy play the role of the character named Ruby?

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Juliet Sharp: Juliet Sharp is a recurring character who exclusively appeared in the "Gossip Girl" television adaptation.  The character was created by "Gossip Girl" producer Stephanie Savage and is portrayed by actress Katie Cassidy.  The series portrays her as a scheming and secretive but caring woman who develops into a formidable antagonist as her agenda against Serena van der Woodsen progressed.  The actions of character has drawn comparisons to another villain of "Gossip Girl", Georgina Sparks, and received positive reviews for her inclusion in the series.  Juliet only appears during the first half of the fourth season, though she returns in the series finale.

Kurt Katch: Kurt Katch (January 28, 1896 – August 14, 1958) was a Polish film and television actor.  Katch was born as Isser Kac.  He appeared in "Quiet Please, Murder", " The Purple V", "The Mask of Dimitrios", "Ali Baba and the Forty Thieves", among many others.  Katch appeared in the first James Bond story filmed (Casino Royale) in 1954 for the Climax!  t.v. show.  Katch died from cancer and is interred at Eden Memorial Park Cemetery in Los Angeles.

Ruby (Supernatural): Ruby is a fictional character on The CW Television Network's "Supernatural" portrayed mainly by actresses Katie Cassidy and Genevieve Cortese.  Created by the writers to expand on the characterization of demons within the series, she first appears in the third season, wherein she assists series protagonists Sam and Dean Winchester in fighting her fellow demons.  By the fourth season, she has won Sam's trust and begins training him to kill demons with his psychic powers, though Dean remains fearful of ulterior motives.  The character departs the series at the end of the fourth season.  Though the fans at first reacted negatively towards Cortese replacing Cassidy after the third season, Cortese and creator Eric Kripke felt that they became more accepting as the fourth season progressed.  While fan response to the character was mixed overall, critical reception was generally negative.  A common criticism was underwhelming performances by Cassidy and Cortese.

Kelli Presley: Kelli Presley is a fictional character in the "Black Christmas" franchise.  The character, created by writer-director Glen Morgan and portrayed by actress Katie Cassidy, serves as the primary protagonist and final girl of the "Black Christmas" remake, acting as a replacement to Jess from the original film.

Supernatural (season 3): The third season of "Supernatural", an American fantasy horror television series created by Eric Kripke, premiered on October 4, 2007, and concluded on May 15, 2008.  Traveling throughout America, protagonists Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) use their father's journal to help them carry on the family business—saving people and hunting supernatural creatures.  The season begins with the brothers tracking down the demons released from Hell in the previous season finale.  They become allies with a demon named Ruby (Katie Cassidy), who claims to know a way to release Dean from his demonic pact—he had sold his soul to a demon and was given a year to live in exchange for Sam's resurrection—and wants to protect them from the new demonic leader Lilith.  As Dean's deadline approaches, their efforts are further hindered by Bela Talbot (Lauren Cohan), a professional thief of occult items who is often at odds with the Winchesters.

Lucas Babin: Lucas Edwin Babin (born July 30, 1979) is an American film and television actor.  He speaks Portuguese fluently and has a twin sister named Kirsten.  Born in Beaumont, Texas, Lucas attended high school in Woodville TX, where his father, Brian Babin was the town mayor.  He then moved to California to live with his brother Leif.  After a couple of years he moved into an apartment in Hollywood with a friend Bryan Gay (also an actor from Woodville).  He pursued an acting modeling career for several years before landing a role in "School of Rock" starring Jack Black.  He then went on to act in several short and independent films before landing a role on the Brazilian T.V. show called "America".  Babin met and married a Brazilian woman and they now have two children.  His television work has included roles in "Undressed" and "Sex and the City".

Pilot (Arrow): The pilot episode of the television series "Arrow" premiered on The CW on October 10, 2012.  It was written by series developers Greg Berlanti, Marc Guggenheim and Andrew Kreisberg, and directed by David Nutter.  The episode introduces Oliver Queen (Stephen Amell), a billionaire playboy, his mother Moira Queen (Susanna Thompson), sister Thea (Willa Holland), new bodyguard John Diggle (David Ramsey), best friend Tommy Merlyn (Colin Donnell), ex-girlfriend Laurel Lance (Katie Cassidy), and her father Detective Quentin Lance (Paul Blackthorne).  It follows Oliver as he returns to Starling City, after having been shipwrecked for five years, and becomes a bow-wielding, hooded vigilante who sets out to right the wrongs of his father, who died during the shipwreck, and save the city.

Tina Gray (A Nightmare on Elm Street): Christina "Tina" Gray (named Christina "Kris" Fowles in the 2010 reboot) is a fictional character in the "A Nightmare on Elm Street" franchise.  She was created by Wes Craven.  The character was portrayed by Amanda Wyss in the original film and Katie Cassidy in the 2010 film.  A high school student whose death is the catalyst for the events of the series, Gray is the false protagonist of the 1984 original film.  She also appears in the novels, "Wes Craven's New Nightmare" (1994), "Freddy vs. Jason" (2003), 2010 reboot, merchandise based on the films, and a claymation version of the character is shown in the documentary "" (2010).  The imagery featuring Gray in the body bag during the dream sequences have been regarded as iconic.

Ruby Lopez: Ruby Lopez is a Television Host, Actress, Producer and Foot Model.  Ruby has extensive on-camera experience.  Ruby hosted the exclusive Videogame show for Yahoo.com called "Reset".  In 2005 Ruby was able to put her passion for cars and hosting to use as a pit reporter for many race series including NASCAR and NHRA and continues to do so today.  Ruby is also a producer and has produced, written and directed two half-hour shows and many commercial spots in the SF Bay Area.  In 2007 Ruby reported for Comcast SportsNet’s new Motorsports show, "Zero to 60", where she interviewed and raced with some of the top drivers.  In Fall 2007 Ruby Lopez became the new reporter on "49ers Total Access", a weekly show that takes you behind the scenes of the 49ers season.  This Fall Ruby will return for her second season on "49ers Total Access".  Ruby also co-hosts alongside former Raiders' TE, Jeremy Brigham on the show, "Outta Bounds", taking you "Outside the Box" of Bay Area's Sports which airs on KICU TV36.

Katie Cassidy: Katherine Evelyn Anita Cassidy (born November 25, 1986) is an American actress.  After initially appearing in minor television roles, she made her film debut in "When a Stranger Calls" (2006).  During the same year, she also had her first starring role as Kelli Presley in "Black Christmas" (2006).  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 as Kris Fowles in "A Nightmare on Elm Street" and a recurring role during the fourth season of "Gossip Girl".

Supporting paragraphs: Ruby (Supernatural) Katie Cassidy
Answer: Supernatural