Question: On which television show does Katie Cassidy play the fictional character, Ruby?

full_context: Document 1: Dean Winchester: Dean Winchester is a fictional character and one of the two protagonists of the American drama television series "Supernatural". He is portrayed by Jensen Ackles. Other versions of the character having been portrayed by Hunter Brochu (toddler), Ridge Canipe (child), Nicolai Lawton-Giustra (pre-teen), Brock Kelly and Dylan Everett (teen), and Chad Everett (elderly).
Document 2: Supernatural (season 1): The first season of "Supernatural", an American fantasy horror television series created by Eric Kripke, premiered on September 13, 2005, and concluded on May 4, 2006 after 22 episodes. It focuses on brothers Sam and Dean Winchester as they track down their father, John, who is on the trail of the demon who killed their mother and Sam's girlfriend. During their travels, they use their father's journal to help them carry on the family business—saving people and hunting supernatural creatures. Jared Padalecki and Jensen Ackles star as Sam and Dean, with Jeffrey Dean Morgan recurring as their father, John, and Nicki Aycox as the demonic Meg Masters. This is the only season to air on The WB Television Network, with all subsequent seasons airing on The CW Television Network, a joint venture of The WB and UPN.
Document 3: 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.
Document 4: Katie Holmes: Kate Noelle Holmes (born December 18, 1978) is an American actress who first achieved fame for her role as Joey Potter on The WB television teen drama "Dawson's Creek" from 1998 to 2003. She appeared in 1998's "Disturbing Behavior", a thriller, which won her an MTV Movie Award for Best Breakthrough Performance. In 2000 Holmes featured in "Wonder Boys," which got positive attention from many leading critics.
Document 5: 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.
Document 6: Zachariah (Supernatural): Zachariah is a fictional character portrayed by Kurt Fuller on The CW Television Network's drama and horror television series "Supernatural". An angel, he first appears in the fourth season and helps manipulate the series protagonist Sam Winchester into releasing Lucifer onto the Earth. In the fifth season, he attempts to convince Dean Winchester into serving as the human vessel for the archangel Michael to start the apocalypse. The opportunity to play an angel initially excited Fuller because he thought that it would give him the chance to break away from his streak of playing villains. Despite the character turning into an antagonist halfway through his appearances, the actor was very proud of the role. Critical reception for the character has been positive, with his sinister humor being of particular note.
Document 7: Kyle Gallner: Kyle Steven Gallner (born October 22, 1986) is an American actor. He is best known for his portrayal of Cassidy "Beaver" Casablancas in the television series "Veronica Mars", superhero Bart Allen in the drama series "Smallville" and Reed Garrett in the police series "", and a lead role as Hasil Farrell in the drama series "Outsiders". He is also well known for his roles in the horror films "The Haunting in Connecticut", "Jennifer's Body" and the remake of "A Nightmare on Elm Street".
Document 8: When a Stranger Calls (2006 film): When a Stranger Calls is a 2006 American horror film directed by Simon West and written by Jake Wade Wall. The film stars Camilla Belle, Brian Geraghty, Katie Cassidy and Clark Gregg. Camilla Belle plays a babysitter who starts to receive threatening phone calls from an unidentified stranger, played by both Tommy Flanagan and Lance Henriksen. The film is a remake of Fred Walton's 1979 horror film of the same name which became a cult classic for its legendary opening 20 minutes which this remake extended to a feature length film.
Document 9: Kathryn Newton: Kathryn Newton (born February 8, 1997) is an American actress best known for her role as Louise Brooks in the CBS television series "Gary Unmarried" as well as for her role as Alex Nelson in the 2012 feature film "Paranormal Activity 4", which earned her the 2013 Young Artist Award for Best Leading Young Actress in a Feature Film. She is also known for portraying the older version of Claire Novak in the CW series "Supernatural".
Document 10: Castiel (Supernatural): Castiel is a fictional character portrayed by Misha Collins on the CW Television Network's American television series "Supernatural". An Angel of the Lord, he first appears in the fourth season, and is used to introduce the theme of Christian theology to the series. In the series, Castiel brings Dean Winchester back from Hell and frequently helps him and his brother Sam in their battles with various demons and angels along the way. During his travels with the Winchesters, Castiel develops friendships with both men. As an angel, he possesses a number of supernatural abilities, including the ability to kill demons. Initially, the character demonstrates complete devotion to God and little emotion. However, his interactions and experiences with Dean Winchester and Sam Winchester, as well as certain revelations about God and his fellow angels, have a humanizing effect on him. This, despite the stress and harm it causes his character, allows him to develop an independent will as the series progresses and helps the show address topics related to free will.
Document 11: 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.
Document 12: 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.
Document 13: Bobby Singer: Robert Steven "Bobby" Singer is a fictional character in The CW Television Network's drama/horror television series "Supernatural" portrayed by Jim Beaver. Named after the show's executive producer, Bobby first appears in the first season finale "Devil's Trap". Although Beaver believed his role would merely be a "one-shot deal", Bobby has become a recurring character on the series, and is one of the characters who has appeared in every season of the show. The character, a "rough but warmhearted" working-class man who hunts supernatural creatures, has evolved over time into a father figure for series protagonists Sam and Dean Winchester. Critics have responded favorably to the character.
Document 14: Katharine Isabelle: Katharine Isabelle Murray (born November 2, 1981) is a Canadian actress best known as a scream queen for her roles in various horror films. Born in Vancouver, British Columbia, she made her screen debut as a child in "Cousins" (1989), followed by supporting roles in numerous films and television series. Initially credited as Katie Murray, she later began using the name Katherine Isobel and subsequently Katharine Isabelle. She has starred in the werewolf horror films, "Ginger Snaps" (2000), its sequel, "" (2004), and "" (2004). Her portrayal of the death-obsessed teen, Ginger Fitzgerald, became one of her most notable roles. Additional roles in horror films include "Disturbing Behavior" (1998), "Carrie" (2002), "Freddy vs. Jason" (2003), "" (2010), and "American Mary" (2012). For her performance in the horror film, "American Mary" (2012), she earned several nominations for best actress, including Fangoria Chainsaw Awards, Screamfest Horror Film Festival and Toronto After Dark Film Festival.
Document 15: 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".
ground_truth: Supernatural