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.
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."