Lilly D. is a villain in the Haunting Hour season 1 episodes "Really You: Part 1" and "Really You: Part 2" and the season 2 episode "The Return of Lilly D", which serves as her last and final appearance.
Lilly D. is first introduced when Lilly "Emily" Carbo is given her from the temporary guardian. She, along with Lilly and Jillian Carbo go to the spa at the Really You Company on the first day she is owned by Lilly.
When Lilly's friends come over, Lilly D. tells one of Lilly’s friends that she doesn't like Lilly at all. Lilly gets mad and breaks her friend's doll. Afterward, Lilly D. is taken away by Jillian until Lilly learns how to behave like a good girl. Later at dinner, Lilly D. knocks over the gray boat onto Jillian's computer/laptop. The only witness is Lilly herself and nobody believes her at all when she says Lilly D. did it. At bedtime, Jillian puts Lilly D. into bed with her and Henry Carbo. Henry disagrees with sleeping in the same bed with a doll and moves Lilly D. back into Lilly's bedroom during the night. In the morning, however, Lilly D. is back in bed with Henry and Jillian.
Soon, more strange things happen to Lilly when she's around Lilly D. like a mirror breaking and writing on the walls. Lilly insists that Lilly D. is alive all along.
To prove that Lilly D. is alive, Brandon Carbo and his friend named Joshua set out to prove Lilly wrong. They put a video camera in Jillian's room, but the next day the tape is missing. Brandon and Joshua take off Lilly D's head and find the words "destroy this doll". After they have put Lilly D. back together and leave the room, Lilly D. puts her head back in place.
When Jillian and Lilly come back from a visit to the doctor, Jillian goes for a shower and doesn't even see or hear Lilly transforming into a doll. Lily D. is now in Lilly's body and has traded places with her. Lilly is now watching everything with only one regular eye. Lilly D. then tells Lilly that she never actually liked her at all. Lily D. then closes Lilly's eye and Lilly is now 100% doll. In Lilly's body, Lilly D. acts like a perfect child, serving her family a dinner, washing dishes and talking kindly. She tries to get Jillian to tell her that she loves her, but Jillian kept finding ways of avoiding saying so, revealing that Lilly wasn't herself at all.
The next morning, Lilly D. is leaving for school when Brandon, Joshua and Jillian realize that Lilly is the doll and Lilly D. is Lilly. Lilly goes back to normal when Jillian says it was all her fault for getting Lily D, and she loves her daughter very much, while Lily D. transforms back into a doll. Before she can get back up, Lilly D. is then hit by a garbage truck and is presumed dead after she was being hit by an incoming garbage truck after trying to get back up. However, Lilly D. is shown to be alive when she grabs one of the girls, thus causing them to run away in fear.
The Return of Lilly D
Sometime after her defeat, she is found by two boys who briefly hassle her before this is witnessed by a little girl named Natalie. Natalie told them to stop dragging her and get Lilly D for herself. Natalie, who shows a quick love for the doll, takes her home and gets shows her to her grandfather.
The doll is sent back to the company where she was created. When the doll maker sees her, she is initially frightened by Lilly D, but relents when she finds a softer presence within the doll and has her fixed. She redelivers the doll to Natalie, who the doll maker see's as a good influence on Lilly D. The doll maker tells Natalie and her grandfather about the doll's having souls (which Natalie's grandfather finds crazy). The other dolls warn the doll maker that Lilly D is still evil after all and that Natalie is in danger/trouble. The doll maker attempts to steal Lilly D back from Natalie, but the doll drops a fish bowl on her head, but it doesn't kill her at all, only knocking her out.
As the other dolls fore shadowed, Lilly D begins to show more darker, murderous, and sadistic traits shortly after the doll maker attack. Natalie finds a wounded baby bird and tries nursing it back to health, but Lilly D show an extreme jealously and late at night tries to abduct and drown the baby bird, but is stopped when Natalie wakes up and Lilly D's secret is finally revealed/exposed. While Natalie's grandfather was on his wheel chair, Lilly D stalks him through the dark halls and knocks him off the wheel chair. Natalie briefly rush to her grandfather's aid before confronting Lilly D in the kitchen all by herself. The doll attempts to stab Natalie to death with a butcher knife, but is disarmed and decapitated by Natalie, as Lilly D's head is in a pot of boiling water. Natalie then puts the lid on top of her head, meaning that the murderous doll is dead for real, and this is the end of Lily D.