mother. Mary explains to Veronica that Lianne was a friend (not a fiend) and that Lianne helped her cover up her pregnancy. It is revealed Trina's father is Principal Moorehead, and Trina confronts him about leaving her at the prom in front of many faculty. Veronica finds the dead rat that Keith picked up at the bus. Veronica deduces that Vice Principal Clemmons deliberately gave Veronica her detention task so that she would find her mother's permanent file and expose Principal Moorehead, leaving Clemmons to be promoted to Principal. Veronica picks up Abel Koontz's (Christian Clemenson) belongings and walks into Meg's (Alona Tal) room where she discovers that Meg is pregnant. After Veronica leaves the room Meg is shown opening her eyes. Production Directed by Nick Marck, "My Mother, the Fiend" was written by Phil Klemmer and Dayna Lynne North. The episode marks Klemmer's eighth writing credit, the fifth and penultimate writing credit for North, and Marck's seventh directing credit. Despite being credited, Wallace (Percy Daggs III), Dick (Ryan Hansen), and Jackie (Tessa Thompson) do not appear in the episode. Among the episode's guest stars are Alyson Hannigan and Charisma Carpenter, who portray Trina Echolls and Kendall Casablancas, respectively. The two previously starred together in Buffy the Vampire Slayer, with Hannigan playing Willow Rosenberg and Carpenter portraying Cordelia Chase. Although the two characters had appeared previously, they had never shared a scene together. Jason Dohring, who portrays Logan, stated that he had a special connection with Hannigan on-set: "We get together and just tease each other, she sucker-punches me. There's just a total, I don't know, we really have a sister-brother thing going on. I've never had that kind of connection with an actress before. It totally works." Dohring also noted that Hannigan responded strongly to any spoilers that she was given during filming of the episode. "My Mother, the Fiend" also marks Hannigan's third and final guest appearance on the show. Hannigan was open to appearing in another episode, but she was unsure whether or not her busy schedule would allow it. She also felt that the character's arc had come to a natural close in this episode. In an interview, Rob Thomas said that due to her busy schedule, it was difficult to write an episode featuring Hannigan. On Hannigan's role in the episode and her future availability, Thomas commented: The episode also features a reappearance by Celeste