Guest Stars Dana Snyder voices Dr. Colosso Audrey Whitby as Cherry Helen Hong as Mrs. Wong Jeff Meacham as Principal Bradford Gabrielle Elyse as Maddy Brooke Sorenson as Madison Major Curda as Lionel Zachary Conneen as Harmony Club Leader William Cowart as Shop Teacher Sonari Jo as Harmony Club Member #2 Adam Simon Krist as Harmony Club Member #3