Guy Vasilovich Director Breanna Yde Mariah Voice Mariah Carey Older Mariah Voice, Executive Producer Henry Winkler Grandpa Bill Voice Michelle Bonilla Principal Reyes Voice Rachel Eggleston Holly Voice Maruti Garikiparthi Bill Voice Laya DeLeon Hayes Vicky Voice Montse Hernandez Grace Voice Bria Danielle Singleton Beth Voice Connie Jackson Grandma Lucy Voice Temple Mathews Screenwriter Mike Young Producer Liz Young Producer Nicolas Atlan Executive Producer Stella Bulochnikov Executive Producer Paul Cummins Executive Producer Richard Finn Film Editing