In "What's the Story, Morning Corey?," Sloane appeared as the object of affection for Merton Dingle, but she appeared to be more interested in Tommy Dawkins. She was later held hostage by Corey Feldman, who was revealed to be a vampire avenging his famous best friend, Corey Haim, but she is rescued by Tommy, Merton, and Lori Baxter. Sloane learns about Tommy being a werewolf, but much to the trio's shock, she's not phased by the fact. In the end of the episode, Sloane was revealed to be working for the Evil Werewolf Syndicate, and she has her sights set on both Tommy and Merton, establishing Sloane's heel turn.
In "Thanks," the evil Sloane is seen with Tommy, which upsets Merton, because Tommy promised that he'd back off. In actuality, this was part of Sloane's evil plan to get to Merton, which she does when she visits him and tells him that she's not interested in Tommy, and later kisses Merton. Sloane's kiss actually kills Merton, which Merton figures out after he dies and witnesses her lips at work. When Tommy shows up to pick up Sloane for their date to the prom, Sloane reveals her alliance to the Syndicate when she is seen with Gil, the only surviving member of the Syndicate, after the rest of them were eaten by vampires.
Sloane also revealed that she's a bounty hunter for the Syndicate and she plans to take Tommy's werewolf powers for her own. When Tommy refuses, Sloane shows him Merton's deceased body, and promises to revive him with her kiss if he gives his powers to her. Tommy agrees, but Merton manages to possess Sloane and kiss his own body to revive him, thwarting her plans. Sloane attempts to kill both Tommy and Merton by blowing kisses to both of them, but Merton manages to ricochet one of them towards Sloane, which kills her.
- Jessica Welch also appeared as the evil Carole Lefevre in Season One's "Cat Woman."