Raven and Chelsea - in an attempt to stand out at a big Halloween party- play around with an old magic spell book, hoping it will inspire them to create great costumes. However, the spell goes awry, and causes the two to turn into cows. Not what they had in mind.
Raven needs to bring up her science grade in order to go out on a date with her crush. She asks Cory and William for help in exchange for fashion advice. But when she falls short on her promise, so does William.
Following one of her visions, Raven and her friends find out that a scout from "Undercover Superstar"(an American Idol-type show) is looking for new talent at Bayside High School, and can't keep the story under wraps. Convinced that a new janitor is one of the scouts, Raven, Eddie, Chelsea, and other kids go out of their way to impress him, as Raven tries to dodge the wrath of an arrogant young hall monitor. Meanwhile Cory has to take piano lessons, but is pre-occupied with his parents old videotape as the musical duet "Toast & Jelly."
Raven is responsible for taking Cory to the dentist. Before they go to the dentist, Raven has a vision about someone having a cavity, and she thinks it is Cory, but later on she finds out that it is her, so Cory and Raven lock themselves in another dentist room, but then Raven sits on the stuff that makes your mouth numb.