When Chloe develops a destructive new superpower, the Hero League orders her to an elite boarding school for superheroes to learn control of her abilities. Faced with the prospect of sending Chloe away for years, the Thundermans split apart, with Phoebe, Barb and Billy taking her into hiding. Max, Hank, and Nora track their rogue family members, until the two factions face off against each other in a full-on battle for the Thundermans’ future.

Kira Kosarin
as Phoebe Thunderman

Jack Griffo
as Max Thunderman

Maya Le Clark
as Chloe Thunderman

Rosa Blasi
as Barb Thunderman

Chris Tallman
as Hank Thunderman

Diego Velazquez
as Billy Thunderman

Addison Riecke
as Nora Thunderman

Daniele Gaither
as President Kickbutt

Ariel Winter
as Cognita

Dana Snyder
as Dr. Colosso (voice)