"Mighty Oak" follows band manager Gina Jackson (Janel Parrish), who struggles with losing her lead singer/brother (Levi Dylan) in a fatal car accident on the way to a gig. A decade later, Gina meets a 10-year-old music prodigy named Oak --who seems to possess the same qualities as her brother, Vaughn. But her friends become concerned when Gina starts to insist that Oak is really the reincarnation of Vaughn.