Title: Christy Jenkins
Content:  established series and be featured in its finale. She added that she had an instant chemistry with her co-star Kaley Cuoco. During the WB's merge with United Paramount Network (UPN) to form the CW Television Network (The CW) in 2006, network executives announced that there was not enough room in the schedule for a Charmed spin-off. Cuoco confirmed that a spin-off involving her character would not be developed during an interview with E!'s Kristin Veitch, and said "Charmed is done". Following the show's cancellation, Brian Krause, who played Leo Wyatt, expressed confusion over the direction of its final season. He questioned the decision to prominently feature Patterson and Cuoco, stating: "I don't know if they were trying to groom talent to go on to something else".
Title: Charmed
Content:  as the Halliwell sisters' whitelighter Leo Wyatt. King departed Charmed at the end of the first season, while Gregory remained on the show until the seventh season. In season two, Greg Vaughan joined the series as the Halliwell sisters' new next-door neighbor Dan Gordon, while Karis Paige Bryant was cast as his niece Jenny Gordon. Bryant left her role midway through the second season, while Vaughan left at the end of the season. Australian actor Julian McMahon joined the cast of Charmed in season three as the half-demon Cole Turner. He departed the show midway through season five. Drew Fuller joined Charmed at the end of the fifth season as Piper and Leo's second son from the future, Chris Halliwell. Fuller left his role at the end of season six. In the eighth and final season, Kaley Cuoco joined the show as the young witch Billie Jenkins.
Title: Billie Jenkins
Content:  Patterson said she had "instant chemistry" with Cuoco and that their connection made acting out their storyline easier. During The WB's merge with United Paramount Network (UPN) to form The CW in 2006, network executives said there was not enough room for a Charmed spin-off. In an interview with E!'s Kristin Veitch, Cuoco confirmed a spin-off involving her character would not be developed, saying "Charmed is done" and that she preferred to participate in other projects. Brian Krause, who played Leo Wyatt, said that he was confused at the direction of the final season, stating "I don't know if they were trying to groom talent to go on 
Title: Coop (Charmed)
Content:  Coop is a fictional character who appeared in the American television supernatural drama Charmed, which aired on the WB Television Network (the WB) from 1998 to 2006. The character was created by executive producer Brad Kern and was portrayed by Victor Webster. Coop is depicted as a Cupid, a magical being associated with love, who is over two centuries old. He appeared in the last seven episodes of the final season of Charmed, and appears in canonical works from the expanded universe material, such as the series' comic book adaptation.
Title: Cole Turner
Content:  Cole Turner is a fictional character on the WB television series Charmed, portrayed by series regular Julian McMahon between seasons three and five. McMahon returned for a guest appearance in the show's seventh season, for its 150th episode. Charmed is a series which focuses on three good witches, the prophesied "Charmed Ones", sisters who battle the forces of evil. Cole is an adversary-turned-ally of the sisters introduced in the third season and a love interest of main character Phoebe Halliwell, portrayed by Alyssa Milano. Like the show's main characters, Cole also possessed a number of magical abilities; the most commonly used were the power to teleport and the power 
Title: List of Charmed characters
Content:  Billie Jenkins (played by Kaley Cuoco) is a young witch who has the power of projection and to move objects with her mind using telekinesis. Billie is introduced into season eight as a college student and a new charge for Paige. While the sisters assume new identities during the first few episodes of the season, she keeps their secret and does some of their magical legwork for them. Billie becomes obsessed with finding her long-lost older sister Christy, who was kidnapped 15 years earlier by The Triad. Billie is eventually reunited with her sister, but does not know that she has been turned evil under the influence of demons. After Christy briefly sways her to betray the Charmed Ones, Billie eventually sides with the sisters in the series finale and is forced to kill Christy in self-defense.
Title: Charmed
Content:  too cheesy," particularly in season eight. Jon Langmead of PopMatters believed that Charmed "slipped markedly" in seasons seven and eight, noting that the final season lost appealing elements such as "smart casting" and "attention to relationship drama" of the show's earlier seasons. Langmead also disliked the introduction of Kaley Cuoco and Marnette Patterson in the eighth season, and felt that Cuoco was "consistently painful to watch." DVD Verdict's Ryan Keefer also felt that Cuoco joining the show was a "poor choice" by the producers, and commented that season eight "failed to recapture the glory days of the first few seasons."
Title: Coop (Charmed)
Content:  In 2010, Charmed gained an officially licensed continuation in the form of a comic book, which is often billed as Charmed: Season 9. The series is published monthly by Zenescope Entertainment. Set eighteen months after the series finale, Coop is seen living a happy, demon-free life with his wife Phoebe and their first daughter, who is named Prudence Johnna Halliwell and nicknamed P.J. by Grams. In the 14th issue of the comic, Cupid's Harrow, after he expressed grief over the fact that he never got to know his family, Phoebe arranged for him to meet his distant relatives, the Coopersmiths. In Issue #20 of the comic, The Old Witchero, Coop and Phoebe welcomed their second daughter, Parker Halliwell.
Title: Kyra (Charmed)
Content:  Charisma Carpenter was initially scheduled for at least two episodes of Charmed; she later confirmed on her official website that Kyra would be a recurring character. Carpenter joked that she was surprised to be considered for such a minor part on the show. In an article for Today, reader Patrick Kelly cited Carpenter's appearances on Charmed as an indicator of her popularity among the 16- to 39-year-old male demographic. The Palm Beach Post 's Kevin D. Thompson said Carpenter was one of the "guest-stars we can't wait to see" for the 2004–05 United States network television schedule. Kyra was created as a separate character from the Seer, played by Debbi Morgan, who was featured as an antagonist in the show's fourth season. When discussing Kyra's introduction, a writer for The Jackson Sun also characterized her as a villain. Carpenter had previously played a seer named Cordelia Chase in the 
Title: Kyra (Charmed)
Content:  Kyra, also known by her title the Seer, is a fictional character from the American television supernatural drama Charmed, which aired on The WB Television Network (The WB) from 1998 to 2006. Kyra was created by executive producer Brad Kern and portrayed by actress Charisma Carpenter. Her original contract was a recurring role that included three episodes in the show's season seven. TV Guide reported the WB had considered promoting her to a series regular. A demon characterized by her powers of divination and precognition, she eventually forms a friendship with Leo Wyatt (Brian Krause) and the Charmed Ones, specifically Phoebe Halliwell (Alyssa Milano), after expressing her desire to become human. Killed by the demon Zankou (Oded Fehr) 

Question: when did kaley cuoco join charmed?
Answer: Charmed Season 8.