He felt Cuoco's presence and comedic timing worked well with Combs, Milano, and McGowan. When describing the introduction of Christy Jenkins, played by Marnette Patterson, Kern said he wanted to end "Charmed" by returning to its initial focus on sisterhood. Billie was Cuoco's first role in a television drama series. Cuoco stated she felt comfortable working with the other actors and felt she was part of the show since its beginning, noting the warm reception from the cast and crew. 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 to something else". Following the show's cancellation, Cuoco said that she preferred working sitcoms rather than dramas. She felt the "18-hour days where you want to kill yourself" did not leave her with enough time to have a life outside of work and the demanding shooting schedule did not allow her enough time to work with Combs, Milano, and McGowan. Cuoco also said she only understood her performance on the show after watching the final cuts of the episodes with the special effects and animations; she explained: "But when you are working, you are waiting and waiting and then things are invisible and things are being thrown, and nothing's in your hand, and I'm like so confused and always asking everyone, 'What's happening?'". Cuoco described the character's wardrobe as "cute and fun", and felt that it matched her own personal style. However, she did take issue with the outfits used for the character's magical transformations. She cried when she first saw her superhero costume for the season eight episode "Battle of the Hexes", which originally included a cape. A writer from WE tv listed Billie's superhero look as one of the show's "sexiest and most bizarre outfits". Cuoco said that she also disliked the black vinyl outfit and wig that she wore during her first two episodes.