In a futuristic-medieval world, warriors must find and defeat all the monsters on Battle Island, collecting their coveted keys in order to become 'Champion'. Cut to Kitty and Orc, two best friends on a mission to help Kitty become Champion their way through cuteness and friendship. The two embark on the journey to Championhood, facing many obstacles and naysayers only to discover a surprise waiting for them at the Ancient Ruins.

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.